Taking a hot bath or shower an hour or two before going to bed can greatly improve your sleep, according to new research
Human body temperatures follow a circadian rhythm that varies throughout the day, said Shahab Haghayegh, a Ph.D. candidate in the university's Department of Biomedical Engineering, who led the research. About an hour and a half before we usually go to sleep, our bodies cool by about 0.5 to 1 degree Fahrenheit. One reason for the effect is that the hypothalamus in the brain regulates body temperature as well as a number of other functions, including the sleep-wake cycle.
Researchers looked at past data through a new lensThe researchers combed through 5,322 studies on sleep and temperature that were published in science databases and then narrowed their scope to 17 papers that specifically sought quantitative data on the effect of water-based passive heating on a wide range of sleep metrics, including sleep onset latency. The team used statistical methods to perform a meta-analysis of the data.
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