Abstract
Sleep can be organized in two quite different ways across homeothermic species: either in one block (monophasic), or in several bouts across the 24 h (polyphasic). Yet, the main relationships between variables, as well as regulating mechanisms, are likely to be similar. Correlations and theories on sleep regulation should thus be examined on both types of sleepers. In previous studies on monophasic humans, we have shown preferential links between the number of ultradian cycles and the rapid eye movement sleep (REMS) time, rather than with its counterpart non-rapid eye movement sleep (NREMS). Here, the sleep of 26 polyphasic mice was examined, both to better describe the NREMS distribution, which is far more complex than in humans, and to replicate the analyses performed on humans. As in humans, the strongest links with the number of cycles were with REMS. Links were not significant with NREMS taken as a whole, although positive correlations were found with the NREMS immediately preceding REMS episodes and inversely significant with the residue. This convergence between monophasic and polyphasic patterns supports the central role played by REMS in sleep alternation.
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Abbreviations
- REMS:
-
Rapid eye movement sleep
- NREMS:
-
Non-rapid eye movement sleep
- Ncy:
-
Number of ultradian sleep cycles
- PR-NREMS:
-
Pre-REMS NREMS immediately precedes REMS episodes
- Res-NREMS:
-
Residual NREMS is found at some distance from the consecutive REMS episode
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Acknowledgments
The authors wish to thank Mrs. Bethan Wallace, who contributed at many stages in the writing of this manuscript. This work was supported by a grant of SOMALCPE (Brussels), a private institution exclusively dedicated to research in psychiatry. Paul Linkowski is supported by the Belgian Fonds National de la Recherche Scientifique. The experiments comply with the “Principles of animal care”, publication No. 86-23, revised 1985 of the National Institute of Health, and also with the current laws in France.
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Le Bon, O., Popa, D., Streel, E. et al. Ultradian cycles in mice: definitions and links with REMS and NREMS. J Comp Physiol A 193, 1021–1032 (2007). https://doi.org/10.1007/s00359-007-0253-7
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DOI: https://doi.org/10.1007/s00359-007-0253-7