Reindeer in the Arctic reduce sleep need during rumination.
Timing and quantity of sleep depend on a circadian (∼24-h) rhythm and a specific sleep requirement. 1 Sleep curtailment results in a homeostatic rebound of more and deeper sleep, the latter reflected in increased electroencephalographic (EEG) slow-wave activity (SWA) during non-rapid eye movement (N...
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ftunivlausanne:oai:serval.unil.ch:BIB_4DA30877E5F4 2024-02-11T10:00:37+01:00 Reindeer in the Arctic reduce sleep need during rumination. Furrer, M. Meier, S.A. Jan, M. Franken, P. Sundset, M.A. Brown, S.A. Wagner, G.C. Huber, R. https://serval.unil.ch/notice/serval:BIB_4DA30877E5F4 https://doi.org/10.1016/j.cub.2023.12.012 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cub.2023.12.012 info:eu-repo/semantics/altIdentifier/pmid/38141616 info:eu-repo/semantics/altIdentifier/eissn/1879-0445 https://serval.unil.ch/notice/serval:BIB_4DA30877E5F4 doi:10.1016/j.cub.2023.12.012 urn:issn:0960-9822 Current biology NREM sleep arctic caribou circadian rhythms reindeer rumination sleep homeostasis slow-wave activity info:eu-repo/semantics/article article ftunivlausanne https://doi.org/10.1016/j.cub.2023.12.012 2024-01-22T01:10:34Z Timing and quantity of sleep depend on a circadian (∼24-h) rhythm and a specific sleep requirement. 1 Sleep curtailment results in a homeostatic rebound of more and deeper sleep, the latter reflected in increased electroencephalographic (EEG) slow-wave activity (SWA) during non-rapid eye movement (NREM) sleep. 2 Circadian rhythms are synchronized by the light-dark cycle but persist under constant conditions. 3 , 4 , 5 Strikingly, arctic reindeer behavior is arrhythmic during the solstices. 6 Moreover, the Arctic's extreme seasonal environmental changes cause large variations in overall activity and food intake. 7 We hypothesized that the maintenance of optimal functioning under these extremely fluctuating conditions would require adaptations not only in daily activity patterns but also in the homeostatic regulation of sleep. We studied sleep using non-invasive EEG in four Eurasian tundra reindeer (Rangifer tarandus tarandus) in Tromsø, Norway (69°N) during the fall equinox and both solstices. As expected, sleep-wake rhythms paralleled daily activity distribution, and sleep deprivation resulted in a homeostatic rebound in all seasons. Yet, these sleep rebounds were smaller in summer and fall than in winter. Surprisingly, SWA decreased not only during NREM sleep but also during rumination. Quantitative modeling revealed that sleep pressure decayed at similar rates during the two behavioral states. Finally, reindeer spent less time in NREM sleep the more they ruminated. These results suggest that they can sleep during rumination. The ability to reduce sleep need during rumination-undisturbed phases for both sleep recovery and digestion-might allow for near-constant feeding in the arctic summer. Article in Journal/Newspaper Arctic Rangifer tarandus Tromsø Tundra Université de Lausanne (UNIL): Serval - Serveur académique lausannois Arctic Norway Tromsø Current Biology 34 2 427 433.e5 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
topic |
NREM sleep arctic caribou circadian rhythms reindeer rumination sleep homeostasis slow-wave activity |
spellingShingle |
NREM sleep arctic caribou circadian rhythms reindeer rumination sleep homeostasis slow-wave activity Furrer, M. Meier, S.A. Jan, M. Franken, P. Sundset, M.A. Brown, S.A. Wagner, G.C. Huber, R. Reindeer in the Arctic reduce sleep need during rumination. |
topic_facet |
NREM sleep arctic caribou circadian rhythms reindeer rumination sleep homeostasis slow-wave activity |
description |
Timing and quantity of sleep depend on a circadian (∼24-h) rhythm and a specific sleep requirement. 1 Sleep curtailment results in a homeostatic rebound of more and deeper sleep, the latter reflected in increased electroencephalographic (EEG) slow-wave activity (SWA) during non-rapid eye movement (NREM) sleep. 2 Circadian rhythms are synchronized by the light-dark cycle but persist under constant conditions. 3 , 4 , 5 Strikingly, arctic reindeer behavior is arrhythmic during the solstices. 6 Moreover, the Arctic's extreme seasonal environmental changes cause large variations in overall activity and food intake. 7 We hypothesized that the maintenance of optimal functioning under these extremely fluctuating conditions would require adaptations not only in daily activity patterns but also in the homeostatic regulation of sleep. We studied sleep using non-invasive EEG in four Eurasian tundra reindeer (Rangifer tarandus tarandus) in Tromsø, Norway (69°N) during the fall equinox and both solstices. As expected, sleep-wake rhythms paralleled daily activity distribution, and sleep deprivation resulted in a homeostatic rebound in all seasons. Yet, these sleep rebounds were smaller in summer and fall than in winter. Surprisingly, SWA decreased not only during NREM sleep but also during rumination. Quantitative modeling revealed that sleep pressure decayed at similar rates during the two behavioral states. Finally, reindeer spent less time in NREM sleep the more they ruminated. These results suggest that they can sleep during rumination. The ability to reduce sleep need during rumination-undisturbed phases for both sleep recovery and digestion-might allow for near-constant feeding in the arctic summer. |
format |
Article in Journal/Newspaper |
author |
Furrer, M. Meier, S.A. Jan, M. Franken, P. Sundset, M.A. Brown, S.A. Wagner, G.C. Huber, R. |
author_facet |
Furrer, M. Meier, S.A. Jan, M. Franken, P. Sundset, M.A. Brown, S.A. Wagner, G.C. Huber, R. |
author_sort |
Furrer, M. |
title |
Reindeer in the Arctic reduce sleep need during rumination. |
title_short |
Reindeer in the Arctic reduce sleep need during rumination. |
title_full |
Reindeer in the Arctic reduce sleep need during rumination. |
title_fullStr |
Reindeer in the Arctic reduce sleep need during rumination. |
title_full_unstemmed |
Reindeer in the Arctic reduce sleep need during rumination. |
title_sort |
reindeer in the arctic reduce sleep need during rumination. |
url |
https://serval.unil.ch/notice/serval:BIB_4DA30877E5F4 https://doi.org/10.1016/j.cub.2023.12.012 |
geographic |
Arctic Norway Tromsø |
geographic_facet |
Arctic Norway Tromsø |
genre |
Arctic Rangifer tarandus Tromsø Tundra |
genre_facet |
Arctic Rangifer tarandus Tromsø Tundra |
op_source |
Current biology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cub.2023.12.012 info:eu-repo/semantics/altIdentifier/pmid/38141616 info:eu-repo/semantics/altIdentifier/eissn/1879-0445 https://serval.unil.ch/notice/serval:BIB_4DA30877E5F4 doi:10.1016/j.cub.2023.12.012 urn:issn:0960-9822 |
op_doi |
https://doi.org/10.1016/j.cub.2023.12.012 |
container_title |
Current Biology |
container_volume |
34 |
container_issue |
2 |
container_start_page |
427 |
op_container_end_page |
433.e5 |
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1790596330411786240 |