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
Adrenaline
Cortisol
Insulin
Insomnia
Narcolepsy
Restless legs syndrome
Sleep apnea
Circadian rhythm
Homeostasis
Metabolism
Neuroplasticity
Caffeine
Exercise
Meditation
Reading