What is quiet sleep?

Quiet sleep, also known as non-rapid eye movement (NREM) sleep, is the stage of sleep in which the body and mind are at rest. It is characterized by slow brain waves, relaxed muscles, and a decreased respiratory rate. Quiet sleep is essential for physical and mental health, as it allows the body to repair and rejuvenate itself.

There are three stages of quiet sleep:

* NREM 1 is the lightest stage of sleep, and is characterized by slow, rolling eye movements and a slight decrease in muscle tone.

* NREM 2 is the deepest stage of quiet sleep, and is characterized by very slow brain waves and complete muscle relaxation.

* NREM 3 is a transitional stage between NREM 2 and REM sleep, and is characterized by bursts of rapid eye movements and increased brain activity.

Quiet sleep is typically associated with the early part of the night, while REM sleep is more common in the later part of the night. Most adults need around 7-8 hours of sleep per night, including both quiet sleep and REM sleep.