Which one of the following phenomenon is closely associated with slow wave sleep -

Slow wave sleep (stage 3 & 4 of NREM sleep) disorders:- Sleepwalking (somnambulism), night tenor (sleep terror or pavomoctumus), Nocturnal enuresis, Bruxism (teeth grinding), and sleep talking (somniloquy). REM sleep events/disorder :- Nightmares, nocturnal penile tumescence, Narcolepsy.