The cortisol awakening response (CAR) is a phenomenon describing the sharp increase in basal cortisol levels shortly after waking from sleep. While extensively studied, little is known about the role of sleep architecture contributing to CAR. Furthermore, the potential for CAR after a shorter bout of sleep - a nap - has not been directly investigated. The current studies thus aimed at assessed sleep duration, time of day, and sleep architecture as potential determinants of the cortisol awakening response. Saliva samples were collected during the first hour (0, 30, 45, 60min) following several EEG-monitored laboratory sleep conditions. Those included afternoon naps wherein 17 participants (4 men; ages 18-26) napped for 50min and 24 participants (11 men; ages 18-24) napped for 90min. Furthermore, 20 participants (10 men; ages 18-35) visited the lab twice and in addition to staying overnight, napped 90min in the morning either under placebo conditions or pharmacologically-manipulated sleep conditions (5mg Zolpidem). Cortisol increases were observed in response to each sleep condition except to 50-min afternoon naps. Furthermore, CARs were predicted by Stage 2 sleep when following nighttime sleep (r=.46, p=.04) and by Stage 1 sleep when following placebo morning naps (r=.54, p=.01). The current study established cortisol awakening responses to naps and implicates sleep duration and architecture in the generation of CAR to both napping and nighttime sleep. Assessing CAR in conjunction with the specific type of sleep may thus contribute to our understanding of mechanisms underlying positive and negative health effects of napping.
This research output has an Altmetric Attention Score of 7. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 17 December 2020.
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#6,948,123
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Outputs of similar age from Psychoneuroendocrinology
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Altmetric has tracked 33,779,198 research outputs across all sources so far. Compared to these this one has done well and is in the 79th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
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