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8 Αυγ 2008 · To characterize nocturnal event histories in the sleep hypnogram, two distinct methods were employed: multistate survival analysis and log-linear models.
1 Δεκ 2023 · Overall, the presence of REM, N2, sleep cycles, and N3 were associated with a normal sleep structure by experts. In contrast, wake, N1, and overall sleep fragmentation (i.e. a high amount of sleep stage changes per hour) contributed to an evaluation of an abnormal hypnogram.
for transitioning between rapid eye movement (REM) and non-REM (NREM) sleep,5 adequately characterizing sleep-stage transitions is a priority to better define the influence of specific factors (e.g., age and sex) on normal sleep structure and orga-nization.
Currently, the field of sleep science broadly generalizes a typical sleep progression as Wake (W, on the hypnogram axis) to Stage 1 (1) to Stage 2 (2) to Stage Slow-wave (S) back to Stage 2 and then Rapid Eye Movement (R). The progression makes up one sleep cycle, which lasts approximately 60–90 min and repeats through the night. Fig. 1.
On a hypnogram, a sleep cycle is usually around 90 minutes and there are four to six cycles of REM/NREM stages that occur during a major period of sleep. Most SWS occurs in the first one or two cycles; this is the deepest period of sleep.
1 Ιουν 2003 · The cycles may be separated by a period of wakefulness and are repeated 36 times each night and are typically displayed as an hypnogram (Fig. 1). The majority of deep (stage 4) NREM sleep occurs in the first and second cycles.
8 Δεκ 2023 · REM Sleep. 10-60 minutes. The breakdown of a person’s sleep into various cycles and stages is commonly referred to as sleep architecture. If someone undergoes a sleep study, their sleep architecture can be represented visually in a hypnogram, or graph.
