What Is Restorative Sleep?

Have you ever woken up feeling unstoppable, ready to tackle whatever life throws at you? On the other hand, have you gone to bed feeling low only to wake up feeling even worse?

If you answered yes to the first question, you’ve likely experienced restorative sleep. 

Restorative sleep happens when you get enough good sleep to help your brain and body repair, recharge, and recover so you’re ready for the day.

When you don’t get enough restorative sleep, you might feel constantly tired, struggle to concentrate, get sick more easily, or find yourself needing caffeine to feel awake and stay alert throughout the day. 

This article explains what restorative sleep is, how it supports physical and cognitive health, signs you might not be getting enough, and what to do to support optimal recovery during sleep.  

Defining restorative sleep: quality vs. quantity

“Restorative sleep is high-quality sleep that lets the mind and body repair and helps people wake up feeling fully refreshed,” explains Carleara Weiss, PhD, RN, sleep science advisor for Aeroflow Sleep.

Shantan Ravula, MD, board-certified sleep medicine physician at Mary Washington Hospital and SOMOS Health, adds that getting sleep that leaves you refreshed depends on how much you get and how good it is. 

In terms of numbers, the American Academy of Sleep Medicine (AASM) recommends adults get seven or more hours of sleep each night. 

As for how good it is, only you can tell.

“Quality is subjective,” says Weiss. However, she adds that doctors can understand how well you sleep by learning about:

• Whether you wake up feeling refreshed
• How long you slept
• How regular your bedtime and wake-up times are
• How often you wake up in the middle of the night
• If you have any sleep disorders such as insomnia or obstructive sleep apnea, and if you’re getting treated for these conditions 

Whether you feel like you’re getting quality sleep also depends on whether you cycle properly through all sleep stages, especially the deep and REM stages that do the real restorative work, Ravula adds.

“You can get the hours and still not get restored if the sleep is fragmented, which is why some people sleep eight hours and wake up exhausted,” he says.

The biological stages of sleep

Sleep happens in two stages that cycle several times a night. These cycles are called NREM (non-rapid eye movement) sleep and REM (Rapid Eye Movement) sleep. Each occurs for 80 to 100 minutes, four to six cycles a night. 

NREM sleep 

NREM makes up 80% of sleep for adults. It happens in three stages:

NREM stage 1

This is a light sleep stage and a transition from wakefulness to sleep, explains Weiss. 

NREM stage 2

By this stage, you’re already asleep. This second stage makes up 50% of the sleep cycle, according to Weiss.

Although it’s also considered light sleep, this is a critical stage for physical recovery, hormone regulation, and learning.

During this stage, Weiss says your body temperature and heart rate lower and your muscles relax.

NREM stage 3

This sleep stage is also called deep sleep or slow-wave sleep. NREM stage 3 is characterized by a slower metabolic rate, greater hormone regulation, and brain restoration through glymphatic function (which flushes out brain waste), says Weiss.

This function is also critical for clearing protein accumulation linked to neurodegenerative disorders such as Alzheimer’s disease, she adds.

REM sleep

REM (Rapid Eye Movement) sleep is a sleep stage where intense brain activity occurs, says Weiss. Your brain is as active as it usually is during waking hours. It usually occurs later in the night. 

In this stage, you have dreams, although the body is mostly temporarily paralyzed, Weiss says. This stage is also linked to emotional processing, memory consolidation, and overall brain health, she adds. 

Sleep duration (how many hours you sleeps in a night) matters as much as sleep architecture (these different stages of sleep during the night), Weiss explains.

You need all sleep stages in the right proportions, which is why timing and continuity matter for quality sleep, not just total hours, adds Ravula.

Physical restoration: tissue repair, HGH, and immune function

Your body repairs and maintains itself during deep sleep.

“Growth hormone is released in pulses during slow-wave sleep, which drives tissue repair and recovery,” says Ravula.

This is why sleep matters so much for healing and for athletes, he adds. 

“The immune system also ramps up repair and defense during sleep, which is part of why we sleep more when we’re sick and why chronic poor sleep leaves people more vulnerable to illness,” says Ravula. “Skimp on deep sleep and you’re skimping on all of that.”

Cognitive restoration: brain detoxification and memory consolidation

“While the body repairs during deep sleep, the brain restores itself too, and it does this through a clearance system called the glymphatic system,” explains Ravula. “The glymphatic system becomes much more active during deep sleep and flushes out metabolic waste products that build up during the day.”

Memory consolidation, moving what you learned during the day into lasting storage, happens heavily during sleep, across both deep and REM stages, adds Ravula.

“So a bad night doesn’t just make you tired; it measurably hurts focus, learning, and mental clarity the next day,” he says.

Signs you aren’t getting restorative sleep

Most people know when they’ve not been sleeping well. But when you’ve become chronically sleep deprived, you start getting used to the signs that you aren’t getting enough sleep. Experts explain some signs to watch for.

Typical signs you aren’t getting restorative sleep, according to Weiss, include waking up feeling tired or exhausted, brain fog, irritability, difficulty with attention and concentration, daytime sleepiness, and waking up with a dry mouth or sore throat. 

Even when you try to increase your alertness, for example, by drinking coffee, you find you can’t, she adds. If you have to rely on caffeine to function, you’re probably not getting restorative sleep, Ravula agrees. 

“If you sleep a full night and still feel like you barely slept, that’s the clearest signal your sleep isn’t doing its job, and it’s worth paying attention to rather than accepting,” he concludes.

Another big sign is sleeping for long hours and still waking up feeling unrefreshed, Ravula says. 

Weiss recommends talking to your healthcare provider if you’re experiencing these symptoms. 

Actionable strategies to optimize sleep restoration

You can adopt simple daily habits to help you get enough restorative sleep. 

“A good starting point is understanding that restorative sleep comes from both daytime and nighttime behavior,” says Weiss.

She recommends anchoring your sleep schedule with behavioral changes for both day and night.

Sleep and wake up at the same times every day

Keep a consistent wake time and bedtime every day, including weekends, and make sure that you allow yourself seven to nine hours of sleep each night, Weiss advises.

Maintaining this consistency helps stabilize your sleep architecture across the night, Ravula explains.

Even when life happens, try to keep variations in this schedule limited to 30 minutes or less, Weiss emphasizes. 

Get morning sunlight

Every day, in the first hour after waking, expose yourself to bright light, says Weiss. Doing this helps anchor your circadian rhythm, your internal body clock that regulates your sleep-wake pattern. 

Even better if you can get bright light from the sun, which also provides much-needed vitamin D. This nutrient also helps regulate sleep.  When your body lacks vitamin D, you might be more likely to have sleep disorders and sleep difficulties.

Have breakfast and exercise regularly

Don’t skip breakfast, says Weiss. “Eat food, not just coffee,” she says.

For exercise, keep a consistent schedule (for example, every day at 6:30 am) as this will also anchor your circadian rhythm, says Weiss.

“Avoid heavy or highly stimulating exercise three hours before bedtime,” she adds.

Have a relaxing routine at night

At the end of the day, try activities that help your body relax and settle into a state that supports restful sleep. 

Weiss advises creating a wind-down routine to promote physical and mental relaxation at least one hour before bedtime. 

“Reduce light exposure and stimulation from electronic devices, avoid social media, keep lights dim, and take a warm shower or bath,” she suggests. “You can also incorporate relaxation techniques such as breathing exercises, gentle yoga, meditation, and prayer to promote relaxation.”

Sleep coach Nancy Rothstein also recommends “reading something relaxing. Preferably not on a screen. Also, journal to get stress out of your head.”

Bonus tips from Rothstein:

• Optimize your sleep environment by keeping your bedroom cool, dark, quiet, and uncluttered
• Manage stress during the day so you do not carry it to bed at night.
• Don’t look at the clock at night if you wake up. It activates your brain when it needs to remain in sleep mode.

“If you’re doing all this and still waking unrefreshed, that can signal an underlying issue like sleep apnea that’s fragmenting your sleep without you knowing,” Ravula adds. “And that’s worth getting evaluated.”

See a doctor if you notice signs you aren’t getting enough restorative sleep, even after maintaining healthy sleep hygiene. 

Choose the best mattress for restorative sleep

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FAQs

How can you tell if your sleep is truly restorative?

You can tell your sleep is restorative if you wake up feeling fully refreshed and energized throughout the day without relying on caffeine to function. Common signs your sleep isn’t restorative include waking up tired, brain fog, irritability, daytime sleepiness, and difficulty concentrating.

How much deep sleep and REM sleep do you need for restorative sleep?

Rather than targeting a specific number of minutes, restorative sleep requires cycling properly through all sleep stages (including deep sleep (NREM stage 3) and REM sleep) four to six times a night in the right proportions.

Overall, non-REM sleep makes up about 80% of adult sleep, while getting the recommended seven or more total hours per night ensures you complete these essential recovery cycles.

Can you get enough hours of sleep and still have non-restorative sleep?

Yes, absolutely. If your sleep is fragmented, interrupted, or compromised by an underlying condition like sleep apnea or insomnia, you can sleep for eight hours and still wake up feeling exhausted because you missed out on the proper progression through deep and REM sleep stages.

Get restorative sleep from Saatva

The right mattress can also help support restorative sleep. Saatva offers a wide range of high-quality mattresses to suit every sleep need. Check out our selection of mattresses and take our mattress quiz to find your perfect match. Restorative sleep is within reach.