Importance of Deep Sleep

Slow wave sleep, also called deep sleep, is an important stage in the sleep cycle that enables proper brain function and memory. It is the stage of sleep you need to feel refreshed when you wake up in the morning.

The two main categories of sleep are called rapid eye movement (REM) sleep and non-REM sleep. You begin the night in non-REM sleep followed by a brief period of REM sleep. The cycle continues throughout the night about every 90 minutes.

There are different stages of Deep Sleep –

  • Stage 1: This is the transition period during which the body and brain shift from a state of wakefulness to one of sleep. This period is relatively short, lasting only a few minutes, and the sleep is fairly light.
  • Stage 2: The second stage of non-REM sleep is another lighter stage of sleep that occurs as the body starts transitioning to deeper sleep. The heart rate and breathing rate slow down, muscles relax further, and eye movements stop.
  • Stage 3: Deep sleep or slow wave sleep is the third stage of non-REM sleep. It occurs in longer periods during the first part of the night. heart rate and breathing rate are at their lowest during this part of the sleep cycle.
  • REM sleep: This is the fourth and final stage of the sleep cycle. The body first goes into REM sleep about 90 minutes after falling asleep. The brain waves start to resemble the brain waves of the wakeful state. The heartbeat and breathing rate speed up.

Benefits of Deep Sleep

During Deep Sleep –

  • Glucose metabolism in the brain increases supporting short-term and long-term memory and overall learning.
  • The pituitary gland secretes important hormones, like human growth hormone, leading to growth and development of the body.
  • Energy restoration happens
  • There is cell regeneration
  • The blood supply to muscles increases promoting growth and repair of tissues and bones

Deep sleep decreases with age. If you’re under age 30, you may get two hours of deep sleep each night. If you’re over age 65, on the other hand, you may only get a half hour of deep sleep each night, or none at all. Deep sleep is an important part of the overall sleep process, but it is just one aspect of a good night’s sleep.


Author: Pallabi Sinha

I am a Nutritionist with 6 years of expertise in the field. I have a knack of convincing people to switch to a healthier lifestyle.