A new study suggests that extending night sleep in mildly sleeping, healthy adults increases daytime alertness and reduces pain sensivity.
“Our results suggest the importance of adequate sleep in various chronic pain conditions or in preparation for elective surgical procedures,” said Timothy Roehrs, the study's principal investigator and lead author.
“We were surprised by the magnitude of the reduction in pain sensitivity, when compared to the reduction produced by taking codeine.”
The study, appearing in the December issue of the journal SLEEP, involved 18 healthy, pain-free, sleepy volunteers. They were randomly assigned to four nights of either maintaining their habitual sleep time or extending their sleep time by spending 10 hours in bed per night. Objective daytime sleepiness was measured using the multiple sleep latency test (MSLT), and pain sensitivity was assessed using a radiant heat stimulus.



