Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41598-021-84625-8
Title: Splitting sleep between the night and a daytime nap reduces homeostatic sleep pressure and enhances long-term memory
Authors: Cousins, JN
Leong, RLF 
Jamaluddin, SA 
Ng, ASC 
Ong, JL 
Chee, MWL 
Issue Date: 1-Dec-2021
Publisher: Springer Science and Business Media LLC
Citation: Cousins, JN, Leong, RLF, Jamaluddin, SA, Ng, ASC, Ong, JL, Chee, MWL (2021-12-01). Splitting sleep between the night and a daytime nap reduces homeostatic sleep pressure and enhances long-term memory. Scientific Reports 11 (1) : 5275-. ScholarBank@NUS Repository. https://doi.org/10.1038/s41598-021-84625-8
Abstract: Daytime naps have been linked with enhanced memory encoding and consolidation. It remains unclear how a daily napping schedule impacts learning throughout the day, and whether these effects are the same for well-rested and sleep restricted individuals. We compared memory in 112 adolescents who underwent two simulated school weeks containing 8 or 6.5 h sleep opportunities each day. Sleep episodes were nocturnal or split between nocturnal sleep and a 90-min afternoon nap, creating four experimental groups: 8 h-continuous, 8 h-split, 6.5 h-continuous and 6.5 h-split. Declarative memory was assessed with picture encoding and an educationally realistic factual knowledge task. Splitting sleep significantly enhanced afternoon picture encoding and factual knowledge under both 6.5 h and 8 h durations. Splitting sleep also significantly reduced slow-wave energy during nocturnal sleep, suggesting lower homeostatic sleep pressure during the day. There was no negative impact of the split sleep schedule on morning performance, despite a reduction in nocturnal sleep. These findings suggest that naps could be incorporated into a daily sleep schedule that provides sufficient sleep and benefits learning.
Source Title: Scientific Reports
URI: https://scholarbank.nus.edu.sg/handle/10635/205943
ISSN: 20452322
DOI: 10.1038/s41598-021-84625-8
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