The Short Answer
Sleep strategy is one of the defining differences between multiday formats. The longer the event, the more critical sleep management becomes. Pre-race sleep banking — getting 8–9 hours for 7 nights before the race — significantly reduces cognitive degradation during the event.
Sleep by Race Format
| Format | Sleep? | Typical Approach |
|---|---|---|
| 24-hour race | Usually no | Push through with caffeine, crew support |
| 48-hour race | Yes, 1–2 naps | 20–30 min power nap around hour 28–32 |
| 6-day race | Yes, nightly | 3–5 hour sleep block + optional afternoon nap |
| Backyard ultra | Possible | Earn sleep time through faster loops (~45 min) |
| Stage race | Yes, full nights | 7–8 hours between stages |
The Science of Sleep Deprivation in Ultras
After 24+ hours without sleep, cognitive performance drops significantly: decision-making slows, reaction times increase, and perceived exertion rises even at the same pace. But even a 20-minute nap can restore significant cognitive function — what sleep researchers call "sleep inertia recovery." The key is setting an alarm to prevent falling into deep sleep, which causes disorientation upon waking.
Sources
- Martin, T. et al. (2018) — "Sleep deprivation in ultramarathon runners." Sleep Medicine Reviews, 42, 130–142.
- Poussel, M. et al. (2015) — "Cognitive performance during 24-h running." Journal of Sports Sciences, 33(4), 354–362.