Enriched sleep environments lengthen lemur sleep duration

Characteristics of the sleep-site are thought to influence the quality and duration of primate sleep, yet only a handful of studies have investigated these links experimentally. Using actigraphy and infrared videography, we quantified sleep in four lemur species (Eulemur coronatus, Lemur catta, Prop...

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Autores principales:	Alexander Q. Vining, Charles L. Nunn, David R. Samson
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ad816ee982df4296bb1a2756d7157e2b
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spelling	oai:doaj.org-article:ad816ee982df4296bb1a2756d7157e2b2021-11-11T06:44:23ZEnriched sleep environments lengthen lemur sleep duration1932-6203https://doaj.org/article/ad816ee982df4296bb1a2756d7157e2b2021-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8559942/?tool=EBIhttps://doaj.org/toc/1932-6203Characteristics of the sleep-site are thought to influence the quality and duration of primate sleep, yet only a handful of studies have investigated these links experimentally. Using actigraphy and infrared videography, we quantified sleep in four lemur species (Eulemur coronatus, Lemur catta, Propithecus coquereli, and Varecia rubra) under two different experimental conditions at the Duke Lemur Center (DLC) in Durham, NC, USA. Individuals from each species underwent three weeks of simultaneous testing to investigate the hypothesis that comfort level of the sleep-site influences sleep. We obtained baseline data on normal sleep, and then, in a pair-wise study design, we compared the daily sleep times, inter-daily activity stability, and intra-daily activity variability of individuals in simultaneous experiments of sleep-site enrichment and sleep-site impoverishment. Over 164 24-hour periods from 8 individuals (2 of each species), we found evidence that enriched sleep-sites increased daily sleep times of lemurs, with an average increase of thirty-two minutes. The effect of sleep-site impoverishment was small and not statistically significant. Though our experimental manipulations altered inter-daily stability and intra-daily variability in activity patterns relative to baseline, the changes did not differ significantly between enriched and impoverished conditions. We conclude that properties of a sleep-site enhancing softness or insulation, more than the factors of surface area or stability, influence lemur sleep, with implications regarding the importance of nest building in primate evolution and the welfare and management of captive lemurs.Alexander Q. ViningCharles L. NunnDavid R. SamsonPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alexander Q. Vining Charles L. Nunn David R. Samson Enriched sleep environments lengthen lemur sleep duration
description	Characteristics of the sleep-site are thought to influence the quality and duration of primate sleep, yet only a handful of studies have investigated these links experimentally. Using actigraphy and infrared videography, we quantified sleep in four lemur species (Eulemur coronatus, Lemur catta, Propithecus coquereli, and Varecia rubra) under two different experimental conditions at the Duke Lemur Center (DLC) in Durham, NC, USA. Individuals from each species underwent three weeks of simultaneous testing to investigate the hypothesis that comfort level of the sleep-site influences sleep. We obtained baseline data on normal sleep, and then, in a pair-wise study design, we compared the daily sleep times, inter-daily activity stability, and intra-daily activity variability of individuals in simultaneous experiments of sleep-site enrichment and sleep-site impoverishment. Over 164 24-hour periods from 8 individuals (2 of each species), we found evidence that enriched sleep-sites increased daily sleep times of lemurs, with an average increase of thirty-two minutes. The effect of sleep-site impoverishment was small and not statistically significant. Though our experimental manipulations altered inter-daily stability and intra-daily variability in activity patterns relative to baseline, the changes did not differ significantly between enriched and impoverished conditions. We conclude that properties of a sleep-site enhancing softness or insulation, more than the factors of surface area or stability, influence lemur sleep, with implications regarding the importance of nest building in primate evolution and the welfare and management of captive lemurs.
format	article
author	Alexander Q. Vining Charles L. Nunn David R. Samson
author_facet	Alexander Q. Vining Charles L. Nunn David R. Samson
author_sort	Alexander Q. Vining
title	Enriched sleep environments lengthen lemur sleep duration
title_short	Enriched sleep environments lengthen lemur sleep duration
title_full	Enriched sleep environments lengthen lemur sleep duration
title_fullStr	Enriched sleep environments lengthen lemur sleep duration
title_full_unstemmed	Enriched sleep environments lengthen lemur sleep duration
title_sort	enriched sleep environments lengthen lemur sleep duration
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/ad816ee982df4296bb1a2756d7157e2b
work_keys_str_mv	AT alexanderqvining enrichedsleepenvironmentslengthenlemursleepduration AT charleslnunn enrichedsleepenvironmentslengthenlemursleepduration AT davidrsamson enrichedsleepenvironmentslengthenlemursleepduration
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Enriched sleep environments lengthen lemur sleep duration

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