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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.
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.
In spite of normal sleep cycling and only minor disruption of sleep continuity, the hypnogram clearly illustrates a consistent pattern of REM-related hypoxemia during sleep due to central and obstructive apneas. View chapter Explore book.
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.
Then, instead of waking, starts a short period of REM sleep, and thereafter going back through the stages (stage 1 -stage 2 and stage 3/4) in a new cycle (see the hypnogram). ... View in...
1 Σεπ 2015 · 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.
