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A comparison of continuous and intermittent EEG recordings in geese: How much data are needed to reliably estimate sleep–wake patterns?
van Hasselt, S.J.; Verhulst, S.; Piersma, T.; Rattenborg, N.C.; Meerlo, P. (2021). A comparison of continuous and intermittent EEG recordings in geese: How much data are needed to reliably estimate sleep–wake patterns? Journal of Sleep Research Early view: e13525. https://dx.doi.org/10.1111/jsr.13525
In: Journal of Sleep Research. Wiley-Blackwell: Hoboken. ISSN 0962-1105; e-ISSN 1365-2869, meer
Peer reviewed article  

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Author keywords
    birds; EEG; geese; scheduled recordings; sleep

Auteurs  Top 
  • van Hasselt, S.J.
  • Verhulst, S.
  • Piersma, T., meer
  • Rattenborg, N.C.
  • Meerlo, P.

Abstract
    Recent technological advancements allow researchers to measure electrophysiological parameters of animals, such as sleep, in remote locations by using miniature dataloggers. Yet, continuous recording of sleep might be constrained by the memory and battery capacity of the recording devices. These limitations can be alleviated by recording intermittently instead of continuously, distributing the limited recording capacity over a longer period. We assessed how reduced sampling of sleep recordings affected measurement precision of NREM sleep, REM sleep, and Wake. We analysed a dataset on sleep in barnacle geese that we resampled following 12 different recording schemes, with data collected for 1 min per 5 min up to 1 min per 60 min in steps of 5 min. Recording 1 min in 5 min still yielded precise estimates of hourly sleep–wake values (correlations of 0.9) while potentially extending the total recording period by a factor of 5. The correlation strength gradually decreased to 0.5 when recording 1 min per 60 min. For hourly values of Wake and NREM sleep, the correlation strength in winter was higher compared with summer, reflecting more fragmented sleep in summer. Interestingly for hourly values of REM sleep, correlations were unaffected by season. Estimates of total 24 h sleep–wake values were similar for all intermittent recording schedules compared to the continuous recording. These data indicate that there is a large safe range in which researchers can periodically record sleep. Increasing the sample size while maintaining precision can substantially increase the statistical power, and is therefore recommended whenever the total recording time is limited.

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