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The low-down on sleeping down low: pigeons shift to lighter forms of sleep when sleeping near the ground

journal contribution
posted on 06.06.2022, 23:15 authored by RK Tisdale, John LeskuJohn Lesku, GJL Beckers, AL Vyssotski, NC Rattenborg
Sleep in birds is composed of two distinct sub-states, remarkably similar to mammalian slow-wave sleep (SWS) and rapid eye movement (REM) sleep. However, it is unclear whether all aspects of mammalian sleep are present in birds.We examined whether birds suppress REM sleep in response to changes in sleeping conditions that presumably evoke an increase in perceived predation risk, as observed previously in rodents. Although pigeons sometimes sleep on the ground, they prefer to sleep on elevated perches at night, probably to avoid nocturnal mammalian ground predators. Few studies to date have investigated how roosting sites affect sleep architecture.We compared sleep in captive pigeons on days with and without access to high perches. On the first (baseline) day, low and high perches were available; on the second day, the high perches were removed; and on the third (recovery) day, the high perches were returned. The total time spent sleeping did not vary significantly between conditions; however, the time spent in REM sleep declined on the low-perch night and increased above baseline when the pigeons slept on the high perch during the recovery night. Although the amount of SWS did not vary significantly between conditions, SWS intensity was lower on the low-perch night, particularly early in the night. The similarity of these responses between birds and mammals suggests that REM sleep is influenced by at least some ecological factors in a similar manner in both groups of animals.

Funding

This project was funded by the Max-Planck-Institut fur Ornithologie. G.J.L.B. is part of the Consortium on Individual Development (CID), which is funded through the Gravitation Program of the Dutch Ministry of Education, Culture and Science (Ministerie van Onderwijs, Cultuur en Wetenschappen) and the Netherlands Organization for Scientific Research (Nederlandse Organisatie voor Wetenschappelijk Onderzoek, NWO; grant number 024.001.003). J.A.L. was supported by the Australian Research Council (DP170101003).

History

Publication Date

01/10/2018

Journal

Journal of Experimental Biology

Volume

221

Issue

19

Article Number

jeb182634

Pagination

9p. (p. 1-9)

Publisher

The Company of Biologists

ISSN

1477-9145

Rights Statement

© 2018. Published by The Company of Biologists Ltd