7-9 hours
10-12 hours
3-4 hours
5-6 hours
REM sleep
Deep sleep
Light sleep
NREM sleep
Better mood
Improved memory
Higher blood pressure
Increased stress
Melatonin
Cortisol
Dopamine
Serotonin
Insomnia
Narcolepsy
Restless legs syndrome
Sleep apnea
NREM Stage 1
NREM Stage 2
NREM Stage 3
REM
Power nap
Cat nap
Deep nap
Quick nap