rhythmic benign variant rhythmic temporal theta of drowsiness true Rhytmic Temporal Theta Bursts of Drowsiness https://www.ncbi.nlm.nih.gov/books/NBK390352/ http://www.case.edu/EpSO.owl#RhytmicTemporalThetaBurstsofDrowsiness Rhythmic temporal theta bursts of drowsiness (psychomotor variant) is characterized by bursts or serial trains of rhythmic theta waves ranging from 5 to 7 hz with a flat-topped, sharp-contoured, or notched appearance.