Stages of Sleep

Stage 1 (NREM-1)

stages between sleep and wakefulness

stage 1: hypnagogic ticks/jerks

muscle twitches in sleep

AKA feeling like falling

stage 1: hypnagogic hallucinations

imagining that something happened, but didn't

imagine phone buzzed, door bell rang, or name was called happens falsely

stage 2 (NREM-2)

slightly deeper stage of sleep

• people in this stage are harder to wake up

stage 2: sleep spindless

bursts of brain activity

helps keep us calm

stage 2: K-complex

suppresses arousal - keeps us asleep

• helps us build memory

• can occur naturally and voluntarily

stage 3 (N-REM 3)

slow wave of sleep

people at this stage are difficult to wake up

sleepwalking and sleep talking occur at this stage

what does REM stand for

rapid eye movement

REM

period of sleep where dreams can happen

• eyes move rapidly beneath eyelids

• muscles are paralyzed

• paradoxical sleep

paradoxical sleep

brain is very active, but body is paralyzed

how long is one cycle of sleep?

90 mins