One study shows that deep sleep helps maintain normal glucose levels, while low levels of deep sleep may contribute to increased risk of type 2 diabetes. R ead more about how sleeps impact muscle growth and recovery here. Studies have shown that a lack of deep sleep decreases muscle mass and is detrimental to bone health. It also increases blood supply to muscles, helping to reduce soreness and fatigue the next day. Your body rebuilds and repairs bone, muscle, and regenerative tissues during deep sleep. Benefits of Deep SleepĬompared to REM sleep, deep sleep is the more physically restorative stage of sleep, yet it benefits many of your systems. One example, though it’s very rare, is a condition called idiopathic hypersomnia, in which individuals can sleep more than 11 hours at night and still feel very tired during the day. The only concern would be if you’re getting a lot of sleep and still excessively tired during the day, which could indicate an underlying sleep disorder or health issue, Vallat notes. “For the majority of people, the more deep sleep, the better.” In general, having too much sleep is never really an issue,” says Raphael Vallat, PhD, senior machine learning data scientist at Oura. Here’s a helpful guide to learn more about your sleep contributors, including deep sleep. If you’re an Oura member, in your Oura App, you can check your Sleep Score to see how much deep sleep you’re getting on a nightly basis and check your trends over time. A lack of deep sleep can also result in unwelcome symptoms such as irritability, daytime fatigue, inability to focus, increased hunger, or a short temper. If you frequently wake up feeling less-than-refreshed or groggy, there’s a chance that you’re not getting enough deep sleep. Sleep more soundly and feel more refreshed with Oura Shop Now How Do You Know If You’re Not Getting Enough Deep Sleep? Note that older adults require less sleep overall, so can expect to get less deep sleep as well. Translation: You can expect about one hour to nearly two hours in this regenerative, healing phase. Research estimates that adults spend about 13 to 23% of their time asleep in deep sleep. (More on why that matters later!) How Much Deep Sleep Do You Need? Typically, deep sleep occurs within an hour of falling asleep and you usually get more deep sleep during the earlier part of the night. Your brain’s electrical activity slows down into long, slow waves known as delta waves, hence the name “slow-wave sleep.” It’s difficult to be woken up during this stage - and if you do, you can expect to feel groggy and “out of it.” Your heart rate and breathing are at their lowest rate, and your muscles are fully relaxed. READ MORE: What Are the Stages of Sleep? What Happens During Deep Sleep?ĭuring deep sleep, your body slows way down. Keep reading to find out the benefits of deep sleep, how much you should get, and how to get more deep sleep. Each stage of sleep is important for a different reason, but deep sleep is where much of the overnight magic happens for your body and mind. During deep sleep, which occurs in the third NREM (non-rapid eye movement) sleep cycle, your body gets busy repairing and restoring many systems, from your brain to your muscles.Īs a refresher, each night your brain takes a rollercoaster ride through the different stages of sleep, which you cycle through four or five times. Deep sleep, also known as slow-wave sleep, is the body’s most rejuvenating sleep stage.
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