How Long Does It Take to Recover From Sleep Deprivation?

You haven’t gotten enough sleep in days, weeks, or even months. You’re exhausted and finally have the time and opportunity to “catch up.” If you’re like me, you might want to hop into bed for twelve, sixteen, or twenty hours. If you’re more realistic than I am, you might hope that simply getting enough sleep for a few days will do the job. In any case, it’s natural to wonder, “How long does it take to recover from sleep deprivation?”

The truth is, it depends on the cause. In some cases, sleep deprivation is due to lifestyle or environmental factors. In others, it’s the result of an unknown health condition. More time in bed won’t necessarily fix the effects of an underlying sleep disorder.

Let's take a deeper look at how long it takes to recover from sleep deprivation in different situations. We'll also explore what supports recovery, signs that exhaustion points to something more, and when to get evaluated.

How long does it take to recover from sleep deprivation?

It can take anywhere from a couple of days to more than a week to fully recover from sleep deprivation, depending on why and how long you were sleep deprived.

Sometimes sleep deprivation is acute (just a day or two). For example, you may have stayed up late while studying for an exam or trying to meet a work deadline. In that case, recovery can be relatively quick. Other times, it’s chronic (weeks or months of not getting enough sleep). In this case, recovery takes longer.

After a night or two of missed sleep

If you’ve only missed sleep for a few nights, then you should return to a normal level of alertness after one or two nights of full sleep, says Rod Mitchell, MC, MSc, psychologist and clinical director at Emotions Therapy Calgary.

However, it might take longer to get back to typical levels of motivation and memory. “That's what people are describing when they say they slept well and still feel flat,” says Mitchell.

In general, Mitchell says you should feel back to normal within a week. 

After weeks or months of sleep deprivation

If you’ve been sleep deprived for weeks or months, recovery will be a more complicated process. Just how long it takes varies from person to person, but Mitchell says that certain people may need weeks to fully recover.

A 2022 review in Sleep Advances recounts several studies where participants had to restrict their sleep for five to seven days. Another study on the subject published in PLOS One restricted participants’ sleep by 30% for ten days.

Taken together, these data suggest you may stop feeling sleepy within 3 days of getting adequate sleep. Other measures, such as some aspects of cognitive performance, may take longer to recover. “Studies often conclude too early to provide an exact amount of time,” Mitchell says.

Unfortunately, there is limited research on how long it takes to recover after more than ten days of sleep deprivation. In one small inpatient study published in Sleep, 15 healthy adults whose sleep was restricted for 3 weeks didn’t fully recover according to certain cognitive measures, even after nine full nights of recovery sleep. This suggests that some effects of prolonged sleep loss may take longer to resolve. The study also didn’t measure sleepiness, which often resolves before other measures do.

According to Mitchell, you should start to see at least some improvement within the first week of getting enough sleep. If not, there may be a bigger issue at play, as we’ll explore later.

Why “catching up” on sleep doesn't always work

Catching up on sleep doesn’t always work because it may not fully repay the sleep debt, and even if it does, it might throw off the consistency the body needs to fully recover.

To be clear, catch-up sleep can occasionally help to some degree. However, if you find it’s not working for you, here are a few reasons that might be.

First, it may not be feasible to fully make up for lost sleep. For example, someone who needs eight hours of sleep but sleeps only five hours a day misses out on 15 hours of sleep in five days. That’s called sleep debt. Getting an hour or two of extra sleep over the weekend won’t necessarily repay all of it.

If a person does sleep many extra hours over the weekend, it’s easy for that to disrupt a person’s sleep schedule. Take me as an example. When I’m sleep deprived, I’ve been known to go to bed at 10 p.m. only to wake up at 2 p.m. the next afternoon. 

You might think that I have "paid off" a lot of my sleep debt. But I’ll likely struggle to fall asleep at a reasonable hour and get a healthy amount of sleep that night. Situations like this can spawn inconsistent sleep patterns, setting the stage for even more sleep deprivation.

Matters are even more complicated if you have insomnia. Mitchell points out that for people who struggle to sleep, "the bed stops being a cue for sleep and starts to be a cue for being awake, and that association outlives the debt that made it." Lying in bed for a long period of time to try to get “catch-up sleep” can reinforce this association, making restful sleep even more elusive. 

What actually ​​helps you recover

Proper sleep hygiene can help you recover from sleep deprivation.

Try a recovery week with a few simple rules. First, wake up each day within a 30-minute window. Unfortunately, that does include days off. “Three hours of sleeping in on Saturday will move your circadian rhythm about three time zones,” says Mitchell.

If you feel you'll need more sleep than usual, it’s best to go to bed early instead of sleeping in. 

"Expect a second wind in the evening when recovering from sleep deprivation, but don’t trust it," notes Mitchell. Still go to bed at a reasonable hour. Staying up late is “how one bad night becomes two.”

Mitchell suggests getting out of bed after 20 minutes if you’re struggling to sleep, so your brain doesn't start to associate the bed with wakefulness instead of sleep. This can make it harder to fall asleep in the long run.

You might feel groggier in the morning after a long recovery sleep than you did before you went to bed. This can be normal. If you wake up unrefreshed, that’s not necessarily a sign to sleep past your scheduled wakeup time.

Be patient with yourself. Sleep deprivation recovery is gradual and requires consistency.

Of course, there are certain situations when sleep hygiene and even getting enough sleep won’t make you feel better. In this case, you need to get the cause evaluated and addressed.

When extra sleep isn't enough

When extra sleep isn’t enough, you should make sure you’ve had enough time to adjust, and if so, consider the possibility of other issues such as health conditions.

Give yourself seven days of sufficient sleep, and see how you feel. It’s normal to feel groggy when you first wake up, so pay closer attention to how you feel in the afternoons (say, 3 p.m.). “If the afternoons are still bad, the sleep debt was never the problem,” says Mitchell.

A common reason people feel excessive daytime sleepiness despite getting more than seven hours of sleep is untreated sleep apnea. This sleep disorder causes breathing to pause many times throughout the night, leading to a surplus of wakeups that a person may not even remember.

Other possible causes include hypersomnolence disorder, depression, anxiety, thyroid issues, or insomnia.

Signs your exhaustion might be more than a rough patch

Here are some signs exhaustion is related to something besides sleep debt:

• Hypersomnia: You feel the need for more than ten hours of sleep per day even after a week of unrestricted sleep.

• Exhaustion: You still feel exhausted or sleepy in the afternoons even after getting at least seven hours of sleep for a week.

• Loud snoring, gasping, choking, or pauses in breathing: These are signs of sleep apnea. A bed partner may notice these symptoms before you do. Note that sleep apnea symptoms can look different in women and may be less likely to include snoring or gasping.

• Morning headaches: Many people with sleep apnea wake up in the morning with headaches.

• Broken sleep: You experience at least three nights of broken sleep weekly for three months. This suggests chronic insomnia.

If you have one or more of these symptoms, it’s a good idea to see a doctor or sleep specialist to explore possible causes.

When to see a sleep provider

You should see a sleep specialist if you're exhausted despite getting enough sleep or have other signs of a sleep disorder.

It’s especially important to see a sleep provider if you’re experiencing severe symptoms or find yourself falling asleep during dangerous situations, such as driving. 

A sleep study can diagnose conditions like sleep apnea. You don’t necessarily need to see a sleep specialist or even get tested in person. Virtual evaluation and testing can also be rigorous and accurate

Take the Sunrise home sleep test, for example. It’s an FDA-cleared device that allows you to test for sleep apnea from home. You just connect it to bluetooth and put the device on your chin while sleeping for two nights. Then, a clinician reviews and interprets your results.

There’s no need to drive to a sleep lab at odd hours and stay overnight. You can access the test through the virtual sleep clinic Dreem Health. Learn how care works at Dreem Health and book an appointment with a Dreem Health sleep provider today.

The bottom line

How long it takes to recover from sleep deprivation depends on its nature, cause, and duration. You can recover from short-term sleep deprivation within a few days. But if you have chronic sleep deprivation, full recovery may take weeks. The good news is that you should start to feel less sleepy within a few days.

You should seek evaluation if you don’t see any improvement within a week of getting adequate sleep, have any signs of health issues such as sleep apnea, or fall asleep at the driving wheel. Seeing your primary care doctor is a good start. You may also want to see a sleep specialist at a virtual clinic like Dreem Health.

Frequently asked questions (FAQs)

Can your brain fully recover from sleep deprivation? 

Yes, your brain can fully recover from short-term sleep deprivation. However, it may take days to weeks, depending on how severely you’ve been sleep-deprived. Researchers are still studying whether all effects of long-term sleep loss are fully reversible.

What's the difference between sleep deprivation and sleep debt?

Sleep deprivation is when you don’t get enough sleep, while sleep debt is the total number of hours you've missed. Let’s say, for example, that you need eight hours of sleep per day. If you’ve gotten only four hours of sleep per day for a week, then you’ve accumulated a sleep debt of 28 hours.

Should I go to the ER if I haven't slept in several days? 

Yes, you should seek medical attention if you haven’t slept at all in several days, says Mitchell.

Firstly, it can be a sign of a health issue. Secondly, sleep deprivation symptoms build the longer you’ve been without sleep, notes a 2018 study in Frontiers in Psychiatry. This is known as the “stages of sleep deprivation.” In later stages, such as if you’ve been awake for more than 48 hours straight, you may experience severe symptoms such as hallucinations.