The last two stage of non-REM sleep is when you sleep deeply.

Non-REM sleep happens first and includes three stages.

There are four total stages of sleep, divided into two phases: When you sleep, your brain goes through natural cycles of activity.

Well-being: People who don’t get enough sleep are at higher risk for developing various health conditions including obesity, diabetes and heart problems.

Lack of sleep may harm the immune system, which protects us from infections.

But studies in animals have shown that getting deprived of REM sleep can shorten lifespans. Survival: Researchers don’t fully understand why sleep is so essential.And certain nerve connections get a chance to turn on, strengthening our brain and thinking ability. They can repair themselves, so they function at their best. If a person is severely sleep deprived, they may even experience neurological problems such as mood swings and hallucinations. Nervous system function: A lack of sleep affects our memory, performance and ability to think clearly.The body also increases production of proteins, which we need for cell growth and to repair damage. The body releases growth hormone during this type of sleep. Growth: In children and young adults, deep sleep (sleep that’s harder to wake from) supports growth.It seems these neurons turn off the signals that keep us awake. Neurons located at the base of the brain are responsible for us falling asleep.These chemicals keep our brain active when we’re awake. Neurons in the brainstem (where the brain and spinal cord meet) produce neurotransmitters called serotonin and norepinephrine.They control whether we’re awake or asleep, depending on which neurons (nerve cells) they’re acting on: Neurotransmitters are chemicals that help the nerves communicate. We know that brain chemicals are very involved in our sleep cycle. While we’ve learned a lot about sleep, there’s still much that’s unknown. Researchers continue to study sleep and its effect on us.

Your brain and body act differently during these different phases. Not getting enough sleep can lead to many health concerns, affecting how you think and feel.ĭuring the night, you cycle through two types of sleep: non-rapid eye movement (non-REM) sleep and rapid eye movement (REM) sleep. A good night’s sleep can help you cope with stress, solve problems or recover from illness. When you sleep, your body has a chance to rest and restore energy. And enough sleep (or lack of it) affects your physical and mental health. But parts of your brain are quite active during sleep. You may think nothing is happening when you sleep.

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