<unk>  is the transition from wakefulness into<unk> .<unk>  usually transmits into non-rapid eye movement<unk>  (NREM<unk>  but under certain circumstances (e.g. narcolepsy) it is possible to transit from wakefulness directly into rapid eye movement<unk>  (REM<unk> .
Sleep onset
Sleep sex
Nightmare
Twilight sleep
Nightscout
Yawn
Mental health day
Rapid eye movement sleep