<prompt> Dreaming is charactersitic of-REM sleepStage II NREM sleepStage IV NREM sleepStage I NREM sleep  <response>: Ans. is a i.e., REM sleep o Features of REM sleep are: -i EEG - Beta-wave, Reappearance of alpha wave, Saw-tooth wave low voltage fast activity, Ponto-genital- occipital spikes.ii Dreamingiii Other features :- Generalized muscular atony, Penile erection, autonomic hyperactivity Increased pulse rate BP and intermittent movement of small muscle groups. 