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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.
8 Αυγ 2008 · To characterize nocturnal event histories in the sleep hypnogram, two distinct methods were employed: multistate survival analysis and log-linear models.
Review of the hypnogram permits rapid assessment of sleep architecture and the influence of sleep state or position upon the frequency of desaturation or apnea. This hypnogram illustrates sleep cycling in an 8-year-old girl with the Chiari II malformation.
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.
By examining the hypnogram, you can see how often you moved through different stages of sleep and how often you woke up during the night. The second chart provides a more detailed view of your sleep, with data broken down into half-hour increments.
conclusions: The description of sleep continuity with log-linear and multistate analysis of the sleep hypnogram suggests that such meth-ods can identify differences in sleep structure that are not evident with conventional sleep-stage summaries.
As displayed in the hypnogram in Figure 1(b), every night's sleep progresses through several such ∼90-min-long NREMS–REMS cycles, with NREMS predominating in the evening cycles (∼75/15 min) and REMS increasing in the morning cycles (∼60/30 min). NREMS in the morning cycles do not reach stage 4 (delta waves), and the longest part of a ...
