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Hypnogram of a 36-year-old man in a sleep laboratory

Hypnogram of a 36-year-old man in a sleep laboratory
This hypnogram represents the movement of a patient through various sleep cycles over the course of a single night; from approximately 10:37 pm to 5:36 am. The stages are listed as W (wake), R (REM sleep, stage R), and N1-N3 (NREM stages N1, N2, and N3). The patient starts by transitioning from wake into light NREM sleep, then to deep NREM sleep, back to light NREM sleep and then into REM sleep. This pattern generally repeats itself with blocks of NREM and REM sleep approximately every 90 minutes.
REM: rapid eye movement; NREM: non-REM.
Graphic 95157 Version 5.0