05/05/2026
Did you know that sleep can affect your cortisol levels? 😴
Dr Josh Smith shares some top tips to avoid feeling wired at night 🛏️
Studies referenced:
Adam EK, Heissel JA, Zeiders KH, et al. Diurnal cortisol slopes and mental and physical health outcomes: a systematic review and meta-analysis. Psychoneuroendocrinology. 2017;83:25–41. doi:10.1016/j.psyneuen.2017.05.019
Anderson AR, Ostermiller L, Lastrapes M, Hales L. Does sunlight exposure predict next-night sleep? A daily diary study among U.S. adults. J Health Psychol. 2025. doi:10.1177/13591053241262643
Haghayegh S, Khoshnevis S, Smolensky MH, Diller KR, Castriotta RJ. Before-bedtime passive body heating by warm shower or bath to improve sleep: a systematic review and meta-analysis. Sleep Med Rev. 2019;46:124–35. doi:10.1016/j.smrv.2019.04.008
Scullin MK, Krueger ML, Ballard HK, Pruett N, Bliwise DL. The effects of bedtime writing on difficulty falling asleep: a polysomnographic study comparing to-do lists and completed activity lists. J Exp Psychol Gen. 2018;147(1):139–46. doi:10.1037/xge0000374