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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 · Sleep stage distribution, sleep cycles, and fragmentation are strong predictors of how an expert interprets a hypnogram. By comparing hypnograms not solely on an epoch-by-epoch basis, but also on these more specific features that drive the evaluation by experts, performance assessment of (automatic) sleep-staging and surrogate sleep trackers ...
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.
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.
universally available, method for assessing sleep continuity is the hypnogram. The graphic representation of sleep-stage se-quence across the night provides a visual depiction of the nor-mal ultradian cycling of sleep. While the hypnogram provides a Characterizing Sleep Structure Using the Hypnogram
14 Ιαν 2024 · While different states of sleep could be discerned from these recordings, unequivocal labeling of sleep stages proved problematic because of significant inter-observer variability.
