<prompt> NREM Sleep true is ?Teeth grindingNarcolepsyNightmaresSleep paralysis  <response>: Ans. A. Teeth grindingSlow wave sleep stage 3 4 of NREM sleep disorders r Sleep walking somnambulism, night terror sleep terror or pavornocturnus, Nocturnal enuresis, Bruxism teeth grinning, and sleep talking somniloquy.REM sleep eventsdisorder:- Nightmares, nocturnal penile tumescence, Narcolepsy. 