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Figure 1 Polysomnography: an overnight summary. The graphs from the top are: 1) hypnogram: the sleep stage report (MOV AWK = movement when awake; REM = rapid eye movement; 1 to 4 = non-rapid eye movement sleep); 2) arousals: each is a single mark; 3) SaO2 = percentage oxygen saturation; 4) apnea score: each is a single mark (Cn.A = central apnea; Ob.A = obstructive apnea; Mx.A = mixed apnea; Hyp = hypopnea; Uns = unscored); 5) PLMs = paroxysmal limb movements; 6) heart rate versus time (beats/minute); 7) body position; this subject remained on his back throughout the study; and 8) time (h).
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