non rem sleep

stage 1

Duration: Lasts just a few minutes (transition from wakefulness to sleep)

What happens:

You drift in and out of sleep

May experience hypnic jerks (sudden muscle twitches)

Easily awakened

Feels like: That floaty, dreamy moment where you’re half-asleep but still aware

stage 2

Duration: 45–55% of total sleep time (the longest stage)

What happens:

Heart rate and body temp drop

Brain starts shutting out external stimuli

Memory consolidation begins (especially motor skills)

Feels like: You’re asleep, but not fully out of it — harder to wake than N1

stage 3

Duration: 15–25% of total sleep time (mostly in the first half of the night)

What happens:

(muscle growth, immune function, tissue repair)

Brain clears out waste (literally detoxes)

Very hard to wake up

Feels like: Total knockout. If someone wakes you up, you’re groggy and confused

What is Non-REM sleep?

Non-REM sleep is a restful sleep state characterized by slower brain waves, reduced heart rate, and no eye movement.

stage 1 waves

Theta waves

stage 2 waves

Theta + Spindles/K-complexes

stage 3 waves

Delta

Manifest Content

The actual dream you remember when you wake up

It’s often strange, symbolic, and disconnected

Latent Content

The hidden psychological meaning behind the dream

unconscious desires, fears, or conflicts — often sexual or aggressive in nature

Altered States of Consciousness (ASCs)

These are mental states that are significantly different from your usual awake, alert experience — in terms of awareness, perception, thinking, or emotions.

__________ used to be called "the gentle tyrant."

Sleep

Psychoactive

capable of altering thinking, perception, and memory

In a typical cycle, it goes

N1 → N2 → N3 → back to N2 → then REM

n1

Which stage involves transition from wakefulness and muscle jerks?