<prompt> Bruxism is seen in ?NREM stage 1,2NREM stage 3,4REMAny of the above  <response>: Ans. is b i.e., NREM stage 3, 4 Slow wave sleep stage 3 4 of NREM sleep disorders :- Sleep walking somnambulism, night terror sleep terror or pavornocturnus, Nocturnal enuresis, Bruxism teeth grinding, and sleep talking somniloquy. REM sleep eventsdisorder :- Nightmares, nocturnal penile tumescence, Narcolepsy. 