Sleep-deprived women have higher rates of cardiovascular disease, obesity, and metabolic dysregulation than do sleep-deprived men. The influences of sex on the ability to recover from sleep loss may underlie these increased risks for morbidity in women. Identification of the factors that are responsible for sex differences in the ability to recover from sleep loss is therefore critical to reducing, and someday eliminating, this gender disparity in sleep health. We have shown that sex differences in the daily sleep amount of mice are dependent on circulating reproductive hormones and that the ability to recover from sleep loss by increasing sleep amount and altering SWA is relatively insensitive to these hormones. This finding led us to hypothesize that sex chromosomes directly influence the ability to recover from sleep loss. Human studies are limited in their ability to examine: 1) the contributions of genetic and phenotypic sex to gender differences in sleep traits and 2) polysomnographic sleep responses to extended chronic sleep loss in men and women. These limitations underscore the need for effective animal models to determine whether sex-specific genetic and hormonal interactions influence sleep opportunities during and after chronic sleep loss. An exciting mouse model of genetic sex now provides an opportunity to examine the discrete contributions of sex chromosomes to sleep regulatory mechanisms. In this four core genotype mouse model of genetic sex, the sex chromosome complement is the opposite of gonadal and phenotypic sex. In addition, refinements in the ability to obtain intracortical recording of slow wave activity (SWA) in active rodents now provide a unique opportunity to determine the regulatory influences of sex on homeostatic sleep responses. By employing a more rigid electrophysiological measurement of SWA and by examining whether sex chromosome complement has influences on the ability of chronic sleep loss to disrupt sleep regulatory mechanisms, these studies will determine the nature of sex differences in sleep alterations caused by chronic sleep loss and increase understanding of the mechanisms underlying those differences.

Public Health Relevance

Sleep is emerging as an important health issue. In today's twenty-four hour society, women suffer disproportionately from the negative health consequences associated with chronic sleep loss. Since negative sleep responses to daily challenges may be a predisposing factor for morbidity, it is important to determine the influences of biological sex on the ability to tolerate chronic sleep loss. These experiments use EEG/LFP/EMG recording in mutant mouse models to determine whether genetic, gonadal, and phenotypic determinants of sex are predisposing factors for sleep dysregulation during and after chronic sleep loss.

National Institute of Health (NIH)
National Institute of Neurological Disorders and Stroke (NINDS)
Research Project (R01)
Project #
Application #
Study Section
Neuroendocrinology, Neuroimmunology, Rhythms and Sleep Study Section (NNRS)
Program Officer
He, Janet
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Morehouse School of Medicine
Schools of Medicine
United States
Zip Code
Ehlen, J Christopher; Brager, Allison J; Baggs, Julie et al. (2017) Bmal1 function in skeletal muscle regulates sleep. Elife 6:
Brager, Allison J; Heemstra, Lydia; Bhambra, Raman et al. (2017) Homeostatic effects of exercise and sleep on metabolic processes in mice with an overexpressed skeletal muscle clock. Biochimie 132:161-165
Nichols, India S; Jones, Mary I; Okere, Chuma et al. (2017) Nitrergic neurons of the dorsal raphe nucleus encode information about stress duration. PLoS One 12:e0187071
Ehlen, J Christopher; Jones, Kelly A; Pinckney, Lennisha et al. (2015) Maternal Ube3a Loss Disrupts Sleep Homeostasis But Leaves Circadian Rhythmicity Largely Intact. J Neurosci 35:13587-98
Evans, Jennifer A; Suen, Ting-Chung; Callif, Ben L et al. (2015) Shell neurons of the master circadian clock coordinate the phase of tissue clocks throughout the brain and body. BMC Biol 13:43
Jefferson, F; Ehlen, J C; Williams, N S et al. (2014) A dopamine receptor d2-type agonist attenuates the ability of stress to alter sleep in mice. Endocrinology 155:4411-21
Ehlen, J Christopher; Hesse, September; Pinckney, Lennisha et al. (2013) Sex chromosomes regulate nighttime sleep propensity during recovery from sleep loss in mice. PLoS One 8:e62205
Brager, Allison J; Ehlen, J Christopher; Castanon-Cervantes, Oscar et al. (2013) Sleep loss and the inflammatory response in mice under chronic environmental circadian disruption. PLoS One 8:e63752
Papale, Ligia A; Makinson, Christopher D; Christopher Ehlen, J et al. (2013) Altered sleep regulation in a mouse model of SCN1A-derived genetic epilepsy with febrile seizures plus (GEFS+). Epilepsia 54:625-34
Ehlen, J Christopher; Jefferson, Felicia; Brager, Allison J et al. (2013) Period-amplitude analysis reveals wake-dependent changes in the electroencephalogram during sleep deprivation. Sleep 36:1723-35

Showing the most recent 10 out of 11 publications