Bruxism is seen in ?
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 events/disorder :- Nightmares, nocturnal penile tumescence, Narcolepsy.
NREM stage 1,2
NREM stage 3,4
REM
Any of the above