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  1. 8 Αυγ 2008 · To characterize nocturnal event histories in the sleep hypnogram, two distinct methods were employed: multistate survival analysis and log-linear models.

  2. 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 ...

  3. en.wikipedia.org › wiki › HypnogramHypnogram - Wikipedia

    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.

  4. 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.

  5. Each cycle starts and follows the stages of non-REM sleep (stage 1 -stage 2 -stage 3/4) and back through the stages (stage 3/4 -stage 2 -stage 1) ( Figure 3). Then, instead of waking, starts a...

  6. 1 Σεπ 2015 · This analysis indicates that as SDB severity increases, waking up from Stage 1 or 2 and going from sleep to a lighter sleep (Stage 2 to Stage 1) happen at increasingly quicker rates while the rates of getting deep sleep and REM from the most common Stage 2 decrease.

  7. 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.

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