Sleep stages

What are the sleep stages?

Sleep includes REM and non-REM stages, each with unique characteristics.

Define REM sleep.

Rapid Eye Movement sleep is when most dreaming occurs, characterized by rapid movement of the eyes.

Difference between REM and non-REM sleep.

REM involves active brain function and dreaming; non-REM is restorative with deep sleep.

What happens in Stage 1 non-REM?

Light sleep occurs, muscle activity decreases, and it's easy to wake up.

Fill in the blank: Stage ___ is deep sleep.

Stage 3 is deep sleep, critical for physical recovery.

True or false: Sleep cycles last about 90 minutes.

True, because each complete cycle includes all sleep stages.

What is Stage 2 non-REM sleep?

A period of light sleep where heart rate slows and body temperature drops.

Define sleep cycle.

A sequence of sleep stages that repeats several times during the night.

Why is deep sleep important?

It helps with physical recovery, growth, and immune function.

Question: What occurs during REM sleep?

Dreaming, increased brain activity, and temporary muscle paralysis.

What changes in sleep as we age?

Aging often reduces deep sleep and increases lighter sleep phases.

True or false: You only dream in REM sleep.

True, because REM is the only stage associated with vivid dreams.

Difference between light sleep and deep sleep.

Light sleep is easier to wake from; deep sleep is restorative and harder to awaken.

What is sleep deprivation?

Lack of sleep that can lead to cognitive and health issues.

Fill in the blank: The first sleep cycle usually has more ___ sleep.

REM sleep, as it increases in duration with each cycle.