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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 · The presence of REM, sleep cycles, and consecutive N2 were found to contribute the most to a hypnogram evaluation as healthy. On the other hand, a high transition index, presence of (long) W, awakenings, and presence of N1 were the strongest contributors to an evaluation as disordered .
Assessing the sleep pattern is fundamental to detect sleep disorders, but also to detect other diseases for which an abnormal sleep cycle is a symptom or indicator.
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.
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 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.
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.
