What's Sleep Debt & Can We Pay It Off?

If you’re getting less sleep than your body needs on an ongoing basis, the cumulative difference is known as sleep debt. For example, if your body requires 8 hours of sleep but you only get 6 per night, you would be losing 2 hours of sleep each night, which adds up to a sleep debt of 14 hours per week.

Sleep debt in adults is very common. One study measured sleep debt by comparing the amount of sleep people get during the workweek with the amount they naturally get on days when they don’t have obligations to wake up. Researchers found that about 30.5% of adults accumulate one hour or more of sleep debt per week, and 9.75% accumulate more than two hours of sleep debt per week.

Certain groups are more likely to accumulate sleep debt, including caregivers, shift workers, people experiencing high levels of stress or anxiety, and those working in the medical field. The most common reasons people miss sleep include work hours, commuting, socializing, relaxing, and watching TV.

One of the most concerning aspects of accumulated sleep debt is that people don’t always feel more tired. Research has shown that individuals can adapt to being chronically sleep deprived so that they no longer feel particularly sleepy. However, their bodies are still experiencing significant declines in both physical and mental performance.

In today’s blog, we’ll cover four sleep habits that can help prevent sleep debt from building up and help you recover when it does happen.

Consistency is best

Getting the amount of sleep your body needs on a consistent basis is the best way to prevent sleep debt. This means going to bed and waking up at roughly the same time every day, even on weekends.

If your work or caregiving schedule allows for it, using simple strategies like setting an alarm on your phone to remind you to start getting ready for bed can help keep you on track. Make sure you leave enough time to complete hygiene tasks and wind-down activities, and remember that it takes the average adult about 20 minutes to fall asleep.

Naps

If you’re already in a sleep deficit, taking a brief afternoon nap can help. Studies have shown that both 10 and 20 minute naps can reduce fatigue and improve cognitive performance for more than two hours afterward. However, naps longer than 30 minutes tend to produce a period of grogginess and reduced alertness after waking.

According to research conducted by NASA, the ideal nap length is about 26 minutes, which can help reduce sleep debt without causing grogginess or interfering with nighttime sleep.

Sleep in on weekends

Ideally, we would maintain the same sleep schedule on both weekdays and weekends. In reality, many people struggle to get the sleep their bodies need because of work or family obligations.

In those cases, sleeping in a little on the weekend can help reduce sleep debt. After reviewing multiple studies on health outcomes, the National Sleep Foundation recommends maintaining a consistent sleep schedule when possible, but notes that 1-2 hours of catch-up sleep on non-work days may be beneficial if you’ve accumulated sleep debt.

Bank sleep

If you know you have an upcoming period where sleep will be limited, it’s possible to “bank” sleep ahead of time by getting extra rest in the days leading up to that period.

While this won’t completely eliminate fatigue, studies have shown that sleep banking can improve cognitive performance, mood, and physical functioning compared to people who did not increase their sleep before a period of sleep deprivation.

Final Thoughts

Sleep debt is something many people accumulate without realizing it, and the tricky part is that your body can adapt in ways that make you feel less tired even while your performance and health are declining.

The best strategy is always to prioritize getting enough sleep consistently, but when life gets busy, there are ways to reduce the impact. Keeping a regular schedule, taking short strategic naps, allowing yourself a little extra sleep on weekends, and banking sleep before demanding periods can all help keep sleep debt from building up too much.

Small adjustments like these can make a meaningful difference in how rested, focused, and healthy you feel over time.

Juginović, A., & Rodman, L. (2026). The Role of Sleep Banking in Reducing Cognitive and Motor Impairments from Subsequent Sleep Restriction: A Narrative Review. Clocks & Sleep, 8(1), 8. https://doi.org/10.3390/clockssleep8010008

Van Dongen HP, Maislin G, Mullington JM, Dinges DF. The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation. Sleep. 2003 Mar 15;26(2):117-26. doi: 10.1093/sleep/26.2.117. Erratum in: Sleep. 2004 Jun 15;27(4):600. PMID: 12683469.