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Sleep loss and REM sleep loss are hyperalgesic
Timothy Roehrs1, Maren Hyde, Brandi Blaisdell
1Henry Ford Health System, Sleep Disorders and Research Center, Detroit, MI 48202, USA. TARoehrs@aol.com
Sleep
|February 24, 2006
Summary
Shortened sleep and loss of REM sleep in healthy individuals can lead to increased pain sensitivity (hyperalgesia) the next day. This suggests sleep disturbances may exacerbate pain conditions.
Area of Science:
- Sleep science
- Pain research
- Neuroscience
Background:
- Disturbed sleep is linked to both acute and chronic pain.
- Existing data suggest that poor sleep quality and reduced sleep duration can intensify pain perception.
Purpose of the Study:
- To investigate the effects of sleep restriction and REM sleep loss on pain sensitivity in healthy, pain-free individuals.
- To determine if modest sleep reductions can induce hyperalgesia.
Main Methods:
- Two protocols were used: a sleep-loss protocol (varying time in bed) and a REM sleep-loss protocol (REM deprivation vs. non-REM control).
- Participants were healthy, pain-free normal sleepers.
- Pain sensitivity was measured using finger-withdrawal latency to radiant heat, and sleepiness was assessed via the Multiple Sleep Latency Test.
Main Results:
- A 25% reduction in finger-withdrawal latency (increased pain sensitivity) was observed after 4 hours of time in bed compared to 8 hours (p < .05).
- REM sleep deprivation led to a 32% reduction in finger-withdrawal latency compared to a non-REM control (p < .02).
Conclusions:
- Modest reductions in total sleep time and specific loss of REM sleep can cause hyperalgesia the following day.
- These findings suggest that treatments or conditions reducing sleep and REM sleep may increase pain sensitivity.
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