Cooler sleeping temperatures may boost your metabolism
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Research with the National Institutes of Health found that sleeping in a cooler environment could have a positive impact on your metabolism. Studies indicate that lower nighttime temperatures may encourage the body to produce more brown fat, a type of fat that burns calories to generate heat, potentially increasing metabolic activity. This natural boost to calorie burning while you sleep could play a role in weight management and overall health. So, turning down the thermostat might not only improve your sleep but all help your body work harder while you rest.
Source
Lee, P., Smith, S., Linderman, J., Courville, A. B., Brychta, R. J., Dieckmann, W., Werner, C. D., Chen, K. Y., & Celi, F. S. (2014). Temperature-acclimated brown adipose tissue modulates insulin sensitivity in humans. Diabetes, 63(11), 3686–3698. https://doi.org/10.2337/db14-0513
Additional Reading
https://abcnews.go.com/Health/cold-lose-weight/story?id=54631686