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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
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Introduction to Stress and Lifestyle01:27

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Related Experiment Video

Updated: Nov 19, 2025

Assessment of Stress Effects on Cognitive Flexibility using an Operant Strategy Shifting Paradigm
07:26

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Sex differences in stress-induced sleep deficits.

Andrew T Gargiulo1, Varuna Jasodanand1, Sandra Luz2

  • 1Department of Psychology, Bryn Mawr College, Bryn Mawr, PA, USA.

Stress (Amsterdam, Netherlands)
|February 2, 2021
PubMed
Summary

Female rats exhibit prolonged insomnia-like symptoms following repeated stress, unlike males. These sleep disruptions, including reduced slow-wave sleep (SWS) and REM sleep (REMS), persist after stress cessation in females, potentially due to a lack of habituation.

Keywords:
REM sleepStressorexinrestraintsex differencesslow-wave sleep

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Sleep Research

Background:

  • Sleep disruptions are key features in stress-related disorders like Major Depressive Disorder (MDD) and Post-Traumatic Stress Disorder (PTSD).
  • These disorders disproportionately affect women, yet sex differences in sleep responses to stress are understudied.
  • Previous work indicated females habituate slower to stress than males.

Purpose of the Study:

  • To investigate sex differences in sleep patterns before, during, and after repeated stress exposure in adult rats.
  • To compare the duration and nature of stress-induced sleep disruptions between male and female rats.

Main Methods:

  • Adult male and female rats were subjected to 5 days of repeated restraint stress.
  • Sleep parameters, including wakefulness, slow-wave sleep (SWS), and REM sleep (REMS), were monitored.
  • Behavioral responses during sleep, particularly upon waking from REMS, were assessed.

Main Results:

  • Repeated stress increased wakefulness and decreased SWS and REMS in female rats.
  • These sleep disruptions in females persisted for at least 2 days after stress termination.
  • Male rats showed only transient effects of stress on sleep, with quicker recovery.
  • Female rats displayed more exaggerated motor responses upon waking from REMS, resembling trauma-related nightmares.

Conclusions:

  • Female rats exhibit persistent, insomnia-like sleep disruptions following repeated stress, contrasting with transient effects in males.
  • The prolonged sleep disturbances in females may stem from their slower habituation to stressors.
  • These findings highlight significant sex differences in the impact of stress on sleep physiology and suggest a potential animal model for stress-related sleep disorders in women.