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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.
This pattern makes up a sleep cycle. There are 4–5 sleep cycles across a night with slow wave sleep predominating in the first part of the night and the REM sleep becoming more prevalent in the second half of the night. REM sleep is associated with muscle atonia and is usually when dreams may be experienced.
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.
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.
Char-acterizing sleep structure using the hypnogram. J Clin Sleep Med. 2008;4(4):XXX-XXX. Quantifying sleep fragmentation is central in assessment of sleep quality. Traditionally, measures such as the arousal frequency and sleep-stage percentages have been used to ap-praise sleep quality in research and clinical practice.
14 Ιαν 2024 · Machine learning assessment showed that certain features of sleep stage distribution, sleep cycles, and sleep fragmentation are important predictors for expert interpretation. The present study thus tackles the gap of knowledge regarding the rating of hypnograms in a comprehensive way.
