What is core sleep

As you sleep, your brain cycles through four stages of sleep. The first three are considered non-rapid eye movement (NREM) sleep, also known as quiet sleep.

The fourth is rapid eye movement (REM) sleep, also known as active sleep.

Stages of sleep

Stages of sleep

Sleep cycle stages time

How long does rem sleep last

How much rem sleep do you need

How much deep sleep do you need

Each sleep stage has a unique function and role in maintaining your brain’s overall cognitive performance. Some stages are also associated with physical repairs that keep you healthy and get you ready for the next day.

This article discusses the four stages of sleep. It also explains what happens during each sleep stage and what can hinder sleep.

Is rem sleep good

NREM Stage 1

The first stage of the sleep cycle is a transition period between wakefulness and sleep.

If you awaken someone during this stage, they might report that they were not asleep.

During stage 1 sleep:

• Your brain slows down
• Your heartbeat, your eye movements, and your breathing slow with it
• Your body relaxes, and your muscles may twitch

This brief period of sleep lasts for around five to 10 minutes.

The brain is still relatively active and producing

what time is your rem sleep

when is the deep sleep