Sleep, Sleeping Pills, and Endurance Performance: What the Evidence Actually Says
The night before your A-race, you cannot sleep. Your alarm is set for 4:30 a.m. You think about the pill in the bathroom cabinet. Should you take it?
This is one of the least-studied questions in endurance sport and one of the most commonly asked. Athletes use sleep aids. Athletes talk about sleep aids. Athletes trade race-week sleep tips in group chats with the confidence of medieval apothecaries.
The actual evidence is much thinner than the advice. But it is not empty. We searched the literature so you do not have to. Here is what is known, what is still guesswork, and what an evidence-based endurance athlete should do when race-night sleep starts looking wobbly.
This article is for educational purposes only and does not constitute medical advice. Sleep medication use should always be discussed with a qualified physician familiar with your medical history, other medications, and the specific demands of your sport. Pace Perfect is not a medical provider.
TL;DR
- Endurance performance suffers measurably after a single night of total sleep deprivation, but often holds up surprisingly well after one or two nights of partial sleep restriction.
- Roughly two-thirds of athletes sleep badly before important competitions. This is normal, predictable, and largely driven by anxiety and intrusive thoughts.
- The direct evidence on sleep medications and next-day endurance performance is extremely thin. Most studies are tiny, male-heavy, and not built around actual endurance time trials.
- Short half-life Z-drugs appear least likely to cause next-day physical performance decrements at standard doses, but the evidence is too small to rule out race-relevant effects.
- Longer-acting benzodiazepines have clearer evidence of next-day impairment and are poor candidates before competition.
- Over-the-counter PM sleep aids built around diphenhydramine or doxylamine deserve more caution than most athletes give them, especially before hot-weather endurance events.
- The single best-supported intervention is sleep extension in the weeks before competition. Boring, legal, free, and annoyingly effective.
- Many sleep medications are not prohibited by WADA, but that is not the same as saying they are safe, smart, or useful on race night.
Why Sleep Matters to Endurance Athletes
The claim that sleep is the foundation of athletic performance gets repeated so often that it can start to sound like wallpaper. The better question is narrower: what do controlled studies actually show in endurance contexts?
The classic single-night sleep deprivation study
Oliver and colleagues ran one of the cleanest experimental tests of acute sleep deprivation on endurance running performance. Eleven trained males completed a 30-minute self-paced treadmill run twice: once after a normal night of sleep, and once after 30 hours of continuous wakefulness. Distance covered fell from approximately 6,224 meters to 6,037 meters. The effect was small, but statistically significant.
The surprising part is what did not change. Heart rate, oxygen uptake, core temperature, skin temperature, and perceived exertion were essentially the same. The runners did not suddenly lose their engine. They chose a slightly slower pace from inside a foggier cockpit.
Sleep loss does not usually break your physiology. It changes how your physiology feels. That distinction matters because endurance racing is not just about the size of the engine. It is about how accurately you can drive it.
Partial sleep restriction is the realistic scenario
Total sleep deprivation is rare before normal endurance races. The common pattern is lighter, choppier, shorter sleep for one or several nights. Carskadon and Dement's foundational work showed that repeated sleep restriction increases subjective sleepiness and physiological sleep pressure. But the sports-performance consequences are more mixed than many athletes assume.
The 2021 expert consensus statement by Walsh and colleagues concluded that evidence for one to three nights of partial sleep restriction impairing athletic performance is equivocal. Skill execution, mood, vigilance, and repeated high-intensity work appear more vulnerable. Maximal aerobic and maximal strength efforts are often preserved.
For runners, cyclists, and triathletes, this is both reassuring and inconvenient. A couple of bad nights probably will not erase your VO₂max. They may, however, blunt pacing judgment, technical execution, motivation, patience, and the ability to make calm decisions when the race gets sharp around the edges.
Sleep extension is the upside most athletes ignore
The strongest intervention in this literature comes from the opposite direction. Mah and colleagues had Stanford men's basketball players extend time in bed to at least ten hours per night for five to seven weeks. Sprint times improved, free throw and three-point accuracy improved, and reaction time and mood improved.
That study used basketball, not running, and it lacked a control group. Those caveats matter. But the size of the improvement made the field pay attention.
Arnal and colleagues later showed that six nights of sleep extension protected psychomotor vigilance during subsequent total sleep deprivation. Walsh's 2021 consensus also cites small endurance-focused work suggesting trained cyclists and triathletes may perform better after several nights of extended sleep compared with habitual sleep.
Chronic sleep extension is the most defensible performance-enhancing sleep intervention in the entire literature. It is free, legal, and side-effect-free, unless your household objects to you becoming impressively unavailable after 9 p.m.
Ultra-endurance is the extreme case
For races lasting more than a single night, sleep deprivation moves from a pre-race concern to an in-race variable. UTMB studies found that cognitive performance and reaction time degrade during extreme mountain ultra-running, with sleep loss and prolonged exercise compounding each other.
Poussel and colleagues found that 72% of UTMB finishers slept zero minutes during the race, while 28% took at least one sleep break. Non-sleepers finished faster, though this does not prove that skipping sleep caused faster finishing. Faster athletes may simply have less need, less opportunity, or less willingness to stop.
The more useful pattern for most endurance athletes is this: bank sleep before, minimize avoidable sleep loss during, and protect recovery after.
Why Athletes Sleep Badly Before Competition
Before discussing remedies, it is worth being precise about the disease. Pre-competition sleep disturbance in athletes is not usually insomnia in the clinical sense. It is a predictable, situational phenomenon. The brain opens seventeen tabs at once, all labeled "what if."
Juliff, Halson, and Peiffer surveyed 283 elite Australian athletes. Sixty-four percent reported worse sleep before an important competition at least once in the prior year. The principal causes were anxiety and intrusive thoughts about the competition, not noise, light, diet, or unfamiliar bedding.
Erlacher and colleagues found a similar pattern in 632 German athletes. Sixty-five point eight percent had experienced poor sleep before competition at some point in their athletic career, and 62.3% had experienced it within the prior twelve months. The most common complaint was trouble falling asleep. The most commonly cited cause was thoughts about the upcoming competition.
Roberts, Teo, and Warmington's systematic review and meta-analysis found that elite athletes slept about 60 minutes less on competition nights compared with previous nights. For night competitions, the sleep loss was closer to 80 minutes.
- This is normal. Sleeping badly before a goal race does not mean you failed race week.
- The cause is mostly cognitive. The best-matched first intervention is not pharmacology. It is reducing anxiety loops and logistical friction.
- Individual-sport athletes may be especially vulnerable. Runners, cyclists, and triathletes often carry the psychological burden alone.
That matters for the Pace Perfect runner. Marathoners and triathletes carry the plan privately: pacing, fueling, weather, bathroom timing, shoe choice, goal time, backup goal, and the quiet horror of having told too many people what they are trying to run.
Sleep Medications: What We Actually Know
This is the question athletes ask most and the literature answers least. Taylor and colleagues' 2016 review remains one of the clearest summaries: athletes use sleep medications, but direct performance evidence is sparse. That remains true.
Melatonin
Melatonin has the best safety profile and the clearest role, but that role is often misunderstood. It is primarily a chronobiotic, meaning it helps shift the body clock. It is better supported for jet lag than for ordinary pre-race anxiety.
The Cochrane review by Herxheimer and Petrie found that melatonin reduced jet lag symptoms after flights crossing five or more time zones, especially when taken at the target bedtime in the destination time zone. Doses above 5 mg did not appear better.
A 2024 systematic review in highly trained athletes found potentially favorable effects on oxidative stress, inflammatory response, and recovery markers, but performance findings were mixed. One included study suggested that an 8 mg dose impaired jump power compared with 5 mg, a useful reminder that more is not automatically better.
Melatonin is useful for travel and circadian timing problems. It is less compelling for "I am anxious in my own bed before a race." Low dose first. High dose is not a bravery contest.
Z-drugs: zolpidem, zopiclone, eszopiclone, zaleplon
Z-drugs act on the GABA-A receptor complex but are structurally distinct from benzodiazepines and generally have shorter half-lives. They are also the sleep medications with the most direct athlete-performance testing, though "most" is carrying a comically heavy backpack in that sentence.
Grobler and colleagues tested zopiclone 7.5 mg, loprazolam 2 mg, and placebo in twelve trained athletes, with testing 10 hours later. Zopiclone did not significantly impair eye-hand coordination, sprinting, agility, VO₂max, or time to exhaustion. Loprazolam produced more hangover and impairment.
Ito and colleagues tested zolpidem 10 mg in seven athletes and found improved subjective sleep latency without impairment in vertical jump or 50-meter sprint performance. Suda and colleagues reported a similar pattern with eszopiclone 2 mg in twelve healthy athletes.
These were tiny studies. Most performance tests were not endurance tests. A 1 to 3% decrement could matter enormously in a race and still be invisible in these sample sizes. Zolpidem also has sex-specific dosing guidance because women, on average, clear the drug more slowly.
Benzodiazepines
Older benzodiazepines are the class with the clearest signal of next-day impairment and the most troubling dependence profile. Charles and colleagues found that nitrazepam produced a marked next-morning hangover and reduced maximal bicycle ergometer performance compared with placebo or temazepam. Grobler's study also showed impairment with loprazolam.
The wider pharmacology matters. Regular benzodiazepine use can lead to tolerance, rebound insomnia, rebound anxiety, and dependence. For a pre-race anxiety problem, that is a trapdoor disguised as a pillow.
Avoid before competition, especially longer-acting agents. They solve the wrong problem with the wrong tail risk.
Dual orexin receptor antagonists: suvorexant, lemborexant, daridorexant
DORAs block the wake-promoting orexin system rather than sedating through GABA. Mechanistically, they are interesting for athletes because they may preserve more natural sleep architecture than traditional sedatives.
But athlete-performance evidence is missing. Suvorexant has a relatively long half-life and carries next-day impairment warnings. Lemborexant and daridorexant appear more favorable in insomnia trials and driving-related assessments, but no DORA has been adequately tested in endurance athletes for next-morning performance.
Promising mechanism, insufficient sport evidence. This is not a race-week experiment category.
Over-the-counter PM antihistamines: diphenhydramine and doxylamine
This is probably the category endurance athletes under-respect the most. Diphenhydramine and doxylamine are first-generation H₁-antihistamines used in many PM sleep products. They are familiar, accessible, and sold in friendly packaging, which can make them feel safer than they are.
Three concerns matter for endurance athletes. First, they can cause next-day sedation and cognitive slowing. Second, they have anticholinergic effects, including reduced sweating and dry mouth, which may matter before hot-weather endurance racing. Third, tolerance to the sleep-inducing effect can develop quickly.
Avoid before hot races and avoid as an untested pre-race tool. OTC does not mean harmless. It just means the box was easy to buy at 9:43 p.m.
Sedating antidepressants: trazodone, mirtazapine, doxepin, amitriptyline
These medications are often used off-label for sleep at low doses. Some have legitimate clinical roles. But for athletes seeking next-day endurance performance, the evidence base is almost nonexistent.
Low-dose doxepin has an approved insomnia use in some countries. Trazodone is commonly prescribed off-label. Mirtazapine and amitriptyline can bring next-day sedation and appetite or weight effects that may matter over time. None should be treated as casual race-night tools.
Alcohol
Alcohol is the most common self-prescribed sleep aid and the easiest one to justify with a shrug. The evidence is not kind. Alcohol shortens sleep onset, consolidates the first half of the night, fragments the second half, and suppresses REM sleep. The result is a counterfeit bargain: easier sleep entry, worse sleep quality.
For endurance athletes, the problem is not just dehydration. REM-rich late-night sleep supports motor learning and skill consolidation. Pacing, breathing rhythm, stride mechanics, descending skill, gear shifting under load, and calm decision-making under fatigue are all skills.
Alcohol has been excluded from the WADA Prohibited List since 2018. Some international federations may still regulate alcohol separately, but WADA itself no longer lists alcohol as prohibited.
Cannabis and CBD
CBD is not prohibited by WADA, but THC and other cannabinoids remain prohibited in-competition. That distinction is not cosmetic. CBD products can be contaminated with THC, mislabeled, or full-spectrum in ways that create anti-doping risk.
The sleep evidence for CBD is mixed. Some users report benefit, but controlled sport-performance data are limited. The most defensible statement is that pure CBD probably does not meaningfully enhance endurance performance and may not reliably improve sleep enough to matter.
Natural and supplemental sleep aids
Magnesium, glycine, L-theanine, ashwagandha, and tart cherry products are widely used by athletes. Their common advantage is that they are generally lower-risk than prescription hypnotics or sedating antihistamines. Their common limitation is that athlete-specific evidence is thin.
Magnesium has modest insomnia evidence in older adults. Glycine at 3 g before bed has shown improvements in subjective sleep quality in healthy volunteers. L-theanine may help stress-related symptoms more than sleep directly. Ashwagandha has RCT evidence for insomnia and anxiety, but supplement contamination remains the bigger athlete risk. Tart cherry juice has better evidence for recovery markers after marathon running than for sleep itself.
Use third-party-tested products when anti-doping risk matters. Natural is not a manufacturing standard.
Sleep Medications at a Glance
| Category | Examples | Direct Athlete Evidence | Anti-Doping Status | Pace Perfect Verdict |
|---|---|---|---|---|
| Melatonin | Immediate-release melatonin, prolonged-release melatonin | Best supported for jet lag and circadian shifting. Athlete performance data are mixed. | Not prohibited by WADA. | Useful selectively. Best for travel or body-clock problems. Low dose first. |
| Short-acting Z-drugs | Zolpidem, zopiclone, eszopiclone, zaleplon | Small studies show no clear next-day decrement at standard doses, but endurance testing is limited. | Not prohibited by WADA. | Possible with physician guidance. Test in training, never combine with alcohol, and allow a full night. |
| Benzodiazepines | Nitrazepam, temazepam, loprazolam, lorazepam, diazepam | Longer-acting agents show next-day impairment in exercise-related testing. | Not prohibited by WADA. | Avoid before competition. Dependence, tolerance, rebound, and hangover risks are real. |
| DORAs | Suvorexant, lemborexant, daridorexant | No direct athlete endurance-performance evidence. | Not prohibited by WADA. | Mechanistically interesting, sport-unproven. Not a race-week experiment. |
| OTC PM antihistamines | Diphenhydramine, doxylamine | No good endurance-performance studies. Concerning next-day and heat-related pharmacology. | Not prohibited by WADA. | Avoid before hot endurance races. Familiar does not mean performance-neutral. |
| Sedating antidepressants | Trazodone, mirtazapine, doxepin, amitriptyline | Little to no athlete-specific evidence. | Not prohibited by WADA. | Medical-context only. Discuss with the prescribing clinician. |
| Alcohol | Beer, wine, spirits | Shortens sleep onset but worsens second-half sleep and suppresses REM. | Excluded from the WADA Prohibited List since 2018. Federation rules may differ. | Avoid as a sleep aid. The seduction is short. The sleep tax is long. |
| CBD | CBD isolate, broad-spectrum CBD, full-spectrum CBD | Sleep evidence equivocal. Performance evidence limited. | CBD is not prohibited. THC and other cannabinoids remain prohibited in-competition. | Probably neutral. Anti-doping risk depends on product quality. |
| Low-risk supplements | Magnesium glycinate, glycine, L-theanine, tart cherry | Some non-athlete or recovery evidence. Limited direct endurance sleep-performance evidence. | Not prohibited in pure form. Contamination risk remains. | Reasonable to test in training. Modest upside, generally low downside. |
Anti-doping status reflects WADA status checked against the current Prohibited List. Athletes should still check GlobalDRO, their national anti-doping agency, and their event or federation rules before competition.
Special Considerations for Endurance Athletes
Sex differences
Almost every athlete sleep-medication study cited above is male-heavy. Zolpidem provides the clearest signal of why that matters. The FDA lowered recommended starting doses for women because of next-morning impairment concerns and slower clearance. For any sedative-hypnotic, female athletes should treat the standard adult dose as an upper bound, not a target, and discuss dose selection with a clinician.
REM sleep, motor learning, and race skill
Walker and colleagues showed that motor skill performance improves overnight after sleep, with the improvement linked to specific sleep stages. Endurance sports are not just plumbing and mitochondria. They include pacing, rhythm, fueling timing, gear choice, cornering, descending, and staying unpanicked when the race tilts sideways.
Anything that suppresses REM or cuts sleep short can interfere with that skill consolidation. This is why "I slept deeply for five hours" is not the same as "I got the sleep I needed." The REM-rich final cycles matter.
Caffeine
Caffeine is one of the best-supported endurance performance aids and one of the most reliable sleep disruptors. That tension is not cleanly solvable. Walsh's consensus highlights that caffeine can disrupt sleep even when taken many hours before bedtime. Habitual afternoon caffeine during heavy training blocks may be costing more recovery than athletes notice.
Jet lag and race travel
Jet lag is not insomnia. It is a body-clock mismatch. The practical rule remains roughly one day per time zone crossed to adjust, with eastward travel usually harder than westward. Melatonin at the destination bedtime, morning light exposure at the destination, and outdoor activity on local time are the main tools.
What the Pace Perfect Runner Should Actually Do
In the weeks before a goal race
Bank sleep. Aim for an extra 30 to 60 minutes per night for two to four weeks. Treat this like training, not self-care confetti. Also address the obvious basics: caffeine timing, screen habits, room temperature, alcohol intake, and possible sleep apnea if you are persistently exhausted despite enough time in bed.
In race week
Do not introduce anything new. No new supplement. No new sleep medication. No new bedtime ritual that turns your room into a tiny wellness laboratory. The "nothing new on race day" rule starts before race day.
For travel races, arrive early when possible, especially when crossing multiple time zones. Use destination-timed light, meals, easy movement, and, when appropriate, low-dose melatonin to nudge the clock.
The night before the race
Expect the night to be imperfect. That expectation alone reduces panic. One bad night is common and usually not performance fatal.
After the race
Protect recovery sleep. The first post-race night is not just collapse. It is tissue repair, immune regulation, and memory consolidation wearing pajamas.
What the Literature Still Does Not Tell Us
Honesty about evidence gaps is not weakness. It is the difference between coaching and horoscope writing.
- No DORA has been adequately tested in athletes for next-day endurance performance.
- No Z-drug has been tested in a large endurance time trial that could detect small but race-relevant performance decrements.
- Female athletes are badly underrepresented in the sleep-medication literature.
- The interaction between sleep aids and common endurance substances such as caffeine, sodium bicarbonate, beetroot, and beta-alanine is not well studied.
- The dose-response curve for sleep extension is unclear. Ten hours in bed may not be necessary, but we do not yet know the minimum effective dose.
- The cumulative effect of repeated pre-race sleep medication use across a long season is not well studied.
An athlete with genuine, occasional pre-competition insomnia may have reasonable medical options. The athlete using sleep medication chronically, off-prescription, in escalating doses, or with alcohol is operating outside the evidence base.
Build the Boring Stuff First
The best race-week sleep strategy is not heroic. It is repeatable: bank sleep, keep caffeine intentional, pack early, avoid new pills, and make race night so familiar it has no room to perform tricks.
- Race-week routines that reduce decision fatigue
- Fueling and caffeine timing built around your start time
- Training structure that protects sleep during peak weeks
- Course-specific pacing so race morning feels less improvised
FAQ
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