NREM sleep

NREM sleep (Non-Rapid Eye Movement sleep) is a phase of sleep that is divided into three stages: N1, N2, and N3. It is characterized by the absence of rapid eye movements, and it is during this phase that the body repairs and regrows tissues, builds bone and muscle, and strengthens the immune system.

Stages of NREM Sleep

N1

The first stage of NREM sleep, N1, is the transition period from wakefulness to sleep. This stage lasts for 5 to 10 minutes and is characterized by slow eye movement, reduced heart rate, and decreased muscle activity.

N2

N2 is the second stage of NREM sleep and lasts for approximately 20 minutes. The body temperature starts to decrease and the heart rate slows further. This stage accounts for 40 to 60 percent of total sleep time.

N3

N3, also known as deep sleep or slow-wave sleep, is the third and final stage of NREM sleep. This is the most restorative stage of sleep, during which the body repairs and regrows tissues, builds bone and muscle, and strengthens the immune system.

Importance of NREM Sleep

NREM sleep is essential for the body's physical and mental restoration. Lack of sufficient NREM sleep can lead to a variety of health problems, including weakened immune system, memory issues, and mood changes.

See Also

• Sleep
• Rapid eye movement sleep
• Sleep deprivation
• Sleep disorders

References

NREM sleep Resources
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