Association of salivary-assessed oxytocin and cortisol levels with time of night and sleep stage

Blagrove, M. and Fouquet, N.C. and Baird, A.L. and Pace-Schott, E.F. and Davies, A.C. and Neuschaffer, J.L. and Henley-Einion, J.A. and Weidemann, C.T. and Thome, J. and McNamara, P. and Turnbull, O.H. (2012) Association of salivary-assessed oxytocin and cortisol levels with time of night and sleep stage. Journal of Neural Transmission, 119 ((10)). pp. 1223-1232. DOI: 10.1007/s00702-012-0880-1

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There have been proposals for REM to have a function of emotional memory consolidation, and also for REM sleep to be involved in the promotion of attachment behaviour. The hormones cortisol and oxytocin, respectively, may be involved in these proposed REM sleep functions. However, there are conflicting reports on whether levels of cortisol differ between sleep stages when time since sleep onset (SSO) is controlled, and virtually no literature on whether levels of oxytocin differ between sleep stages. This study thus investigated the changes in levels of oxytocin (OT) and cortisol (CT) across the night, and whether these levels differ between REM and N2 sleep when time SSO is controlled. 20 participants (10 males, 10 females, mean age = 20.45, SD = 2.01) were awakened 10 min into REM and N2 sleep periods in the sleep laboratory and gave saliva samples which were assayed for OT and CT. Levels of OT were relatively constant across the night, whereas CT increased significantly. REM and N2 did not differ significantly neither for OT nor for CT. The study has implications for models of sleep-dependent memory consolidation that incorporate the late sleep increase in cortisol as a functional component of memory consolidation, and also for the medical diagnostic assaying of OT during sleep.

Item Type: Article
Subjects: Research Publications
Departments: College of Health and Behavioural Sciences > School of Psychology
Date Deposited: 09 Dec 2014 16:50
Last Modified: 23 Sep 2015 03:12
ISSN: 0300-9564
URI: http://e.bangor.ac.uk/id/eprint/1227
Identification Number: DOI: 10.1007/s00702-012-0880-1
Publisher: Springer
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