How much do you know about sleep?

Scientists have found that there are   five stages of sleep.

Stage 1

It's a stage of very light sleep.

 Breathing is smooth, but the brain isn't sleeping.

stage 2

The brain begins to slow down.

stage 3 and 4

These are deep sleep stages.

During these stages, the brain slows   down more and more. 

The person doesn't wake up easily.

Stage 4 is the deepest sleep of all.

Sometimes people get out of bed and walk around during this stage!

Stage 5

The brain begins to wake up again.

During this stage, people dream the

most.