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. 2013 Nov 13;7:178. doi: 10.3389/fncir.2013.00178

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Copyright © 2013 Sorribes, Þorsteinsson, Arnardóttir, Jóhannesdóttir, Sigurgeirsson, de Polavieja and Karlsson.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Sleep parameters during the night in humans across age groups: Children (blue), Preteens and teens (green), Adults (orange), and Adults 50 + (red). Colored asterisks above bars indicate a statistically significant difference between the bar group and the group with the corresponding color of the asterisk. (A) Percentage sleep time. The mean percentage of sleep is significantly lower in Adults older than 50 than in all other age groups. (B) Mean sleep bout length. There is no difference between age groups in the mean duration of the sleep bouts. (C) The number of sleep bouts during nightly sleep do not change across the age groups. (D) Sleep bout fragmentation (bouts/min). There are no significant changes of the sleep fragmentation with age. Diamond, white line, and squares indicate mean, median, and outlier values, respectively.