Comparison of sleep spindles’ characteristics in descending compared to 
ascending slope of the NREM/REM sleep cycle

Koutras, A; Zouridis, I; Kostopoulos, G

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Comparison of sleep spindles’ characteristics in descending compared to ascending slope of the NREM/REM sleep cycle

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Zouridis, I
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Koutras, A., Zouridis, I., & Kostopoulos, G. (2016). Comparison of sleep spindles’ characteristics in descending compared to ascending slope of the NREM/REM sleep cycle. Poster presented at 1st International Conference on Sleep Spindling and Related Phenomena (SleepSpindles 2016), Budapest, Hungary.

Cite as: https://hdl.handle.net/21.11116/0000-0000-7B87-E

Abstract

Sleep microstructural elements’ distribution and features differ between descending (D) and ascending (A) NREM slopes of each sleep cycle, reflecting the asymmetrical dynamics of sleep- and wake-promoting neuronal systems [1]. Among these elements, sleep spindles and K-complexes play significant roles in sleep regulation and sensory processing during sleep. This study aims to compare the distribution of sleep spindles and spontaneous K-complexes (KC) in D and A NREM sleep. All-night polysomnographic recordings of young, healthy sleepers were examined and sleep cycles with a regular, uninterrupted by prolonged wakefulness, succession of sleep stages were selected for quantitative analysis. Calculated parameters for D and A slopes of each sleep cycle include their duration, the rate of appearance of sleep spindles and KC, as well as the mean duration and inter-event interval distribution of sleep spindles. Our results indicate that D NREM slopes of sleep cycles are of longer duration and lower composition in KC than A slopes, confirming previous reports concerning their respective domination by sleep- and wake-promoting mechanisms [1]. Moreover, we found that sleep spindles in D appear more frequently, although have comparable 0.2-0.3 Hz periodicity and mean duration to those in A NREM sleep. We view the above results as providing support to the hypothesis of sensory input-driven NREM sleep regulation [1]. Comparison of sleep spindles’ characteristics in descending compared to ascending slope of the nrem/rem sleep cycle (PDF Download Available).