You may run at the gym for thirty minutes to burn some calories. You might lift some weights or prepare a protein meal for dinner to build your muscles. But to be healthy overall, you may wonder what’s the best thing to do.
You know that exercise and eating right are good for you, but do you realize sleep is crucial for your health too? And just like various types of exercise and nutrients work together for health, you need types of sleep. Both Rapid Eye Movement (REM) and non-REM (NREM) types of sleep contribute to your physical and mental health. NREM sleep has 3 different stages, one of which is deep sleep. [1-3]
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Today, sleeping deeply isn't getting any easier. The arrival of technology—in the form of tablets and smartphones, specifically—has only presented new challenges for recharging our bodies overnight.
While we often hear that the average adult should obtain anywhere from seven to nine hours of total sleep each night, the quality of our sleep (i.e., getting the right amount of deep sleep) is just as important.
What is Deep Sleep?
Deep sleep is the third stage of NREM sleep, so you may hear it called NREM Stage 3 or N3. In sleep medicine, deep sleep may be called slow-wave sleep (SWS), because your brain waves are the slowest at this stage.
It may also be called “delta sleep” because delta waves are seen on the electroencephalogram (EEG). These slow delta waves indicate you’ve reached a deeply meditative and dream-free sleep.
It can be difficult to wake someone up when they are in the deepest stage of sleep. During this period, everything drops further: your heart rate, your breathing, your blood pressure, your muscle activity. Deep sleep is most dense in the first half of the night, which happens right before our body drops to its lowest point temperature-wise.
It’s also important to note that this is the most restorative stage of sleep. If you consistently wake up not feeling refreshed in the morning, it is possible you aren’t getting enough deep sleep 
Did You Know: During this stage, brain activity is reduced, but studies have found that deep sleep contributes to memory, creativity , and insightful thinking. .
Why Is Deep Sleep Important?
If you're looking for one sentence that describes the importance of deep sleep, read this:
Deep sleep helps your mind and body heal.
It has vital power for us physically, including cell regeneration, a boosted immune system, bone and tissue repair, and so much more. Ultimately, acquiring enough deep sleep lets you renew your energy levels to face every day.
Deep sleep is also associated with cognitive performance. Having a sluggish brain is a sign you're not getting enough. It's also tied to memory reconciliation. During the day, you don't organize your memories—this takes place at night while you sleep. 
Think about your memories as files on a desk. Getting enough deep sleep allows you to determine what memories are important and which aren't, effectively "clearing" your desk overnight.
Obtaining deep sleep significantly affects both your short-term and long-term memory, which explains why lack of sleep has been associated with Alzheimer's disease. 
Deep Sleep Studies
A sleep study involves the clinical evaluation of your sleep using polysomnography. This gold standard procedure for determining whether or not you have problems with your sleep involves monitoring the activity of the brain, heart, lungs, and muscles.
Brain waves help sleep medicine specialists know what sleep stage you are in by monitoring your brain waves on an EEG (electroencephalogram).
Today, sleep studies used only to be completed in clinic or sleep lab settings, but now there are home-based options.
How Much Deep Sleep Do I Need?
Now that you understand the difference between the sleep stages, we can discuss how much deep sleep is needed. The first cycle of deep sleep may last 20-40 minutes . Experts say that deep sleep should make up about 15-20% of your total sleep time. So, if you sleep 8 hours, then you should have between 1-2 hours of deep sleep. [1-3]
Nevertheless, according to the Committee on Sleep Medicine and Research, how much you get will depend on your current sleep needs and age. 
They also reported a drop in deep sleep over time as we age. This occurs due to changes in hormones as the body produces lower growth hormone levels each year. Also, sleep patterns differ among women depending on their menstrual cycle or if they are pregnant.
Tossing and turning during the night, waking up feeling tired, being easily awakened, and even getting up to use the bathroom are signs of disturbed sleep. If you have increased daytime sleepiness and changes in mood, you may not be getting enough deep sleep .
Lack of Deep Sleep
Poor sleep quality generally contributes to health conditions, including obesity, mood disorders, heart disease, and migraines.
Loss of Deep Sleep Increase:
- High Blood Pressure
- Stroke or Heart Attack
- Alzheimer’s Disease or Dementia
- Type 2 Diabetes
Deep Sleep Statistic: Most adults should aim to get seven to nine hours of sleep at night .
How Does Deep Sleep Affect My Overall Health?
Now that you better understand deep sleep, the following occurs:
- Respiration, heartbeat and eye movements decrease
- Muscles fall at ease
- Brain waves start to transition you from being awake to being asleep
- Your core temperature drops
- You can probably guess how restorative it can be.
Some people struggle to wake up during this stage. But if a telephone, an alarm, or a barking dog wakes you from a deep sleep, you’ve probably felt confused and groggy due to the disruption.
Ever get woken up from a deep sleep and find yourself confused? That initial state is called sleep inertia. It often happens when a person wakes unexpectedly or outside of normal sleep cycles. That “brain fog” can last for up to 30 minutes to an hour. 
Read More: Sleep Inertia: Current Insights
A lot is going on during the deep sleep stage. Suppose you’ve ever had a rough night of sleep, tossing and turning, or experiencing insomnia. You know deep sleep affects cognitive performance, especially for your short- and long-term memory and your brain’s ability to absorb new information . It's a necessary part of our sleep process, but deep sleep is only one factor of a good night's sleep.
How Do We Get More Deep Sleep?
Deep sleep is the most restorative stage of sleep, and it's essential for our physical and mental health. So, is there a way to improve our deep sleep? Yes, learn more on how to increase the amount of deep sleep with 10 practical tips and tricks and start enjoying the benefits of deep sleep.
Find Your Deep Sleep Sweet Spot
Though sleep needs vary from person to person, they are based on ingrained habits and bedtime routines. It's important to listen to your body. If you are tired, don't fight it; go to sleep. But if you can’t fall asleep within 20 minutes, don't stay in bed. Give one of the following a try if you can't fall asleep:
Can't Sleep, Do The Following
- Perform meditating exercises, such as Yoga Midra
- Write your thoughts in a journal
- Listening to Calming, Instrumental Music
- Read a Magazine or Book
Since deep sleep happens early, try half-hour increments to find the right time to go to bed. After that, seeing a sleep specialist might help uncover the problem if you're still struggling to fall asleep.
If you've learned anything from this post, it should be this: getting more deep sleep is essential for your long-term health. Take every measure possible to ensure you're getting it consistently.
As you can see, we need deep sleep for plenty of reasons. Along with being important, there are a few examples that illustrate why it’s necessary to get as much deep sleep as attainable on a nightly basis:
- Increases growth of cell regeneration
- Helps obtain a stronger immune system
- Renews energy
- Develops, grow, and repair bones and tissues
- Boosts memory and learning
- Repairs muscle and tissue
- Enhances metabolism, heart health, and hormonal balance
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