The effect on pain tolerance appears strongest in people who suffer from both insomnia and chronic pain, who may benefit from treatments targeting both conditions.
    
The study included more than 10,400 adults from a large, ongoing Norwegian health study.Each subject underwent a standard test of pain sensitivity - the cold pressor test - in which subjects are asked to keep their hand submerged in a cold water bath.
    
Subjects were asked about various types of sleep impairment, including insomnia, total sleep time, and sleep latency (time to falling asleep), and researchers assessed the relationships between measures of sleep impairment and pain sensitivity.
    
The study also looked at other factors potentially affecting sleep impairment and pain perception, including chronic (persistent or recurring) pain and psychological distress (such as depression and anxiety).

 

 

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