Regular sauna use can help improve sleep quality by helping you fall asleep faster, stay asleep longer, and wake up feeling more refreshed. The heat from a sauna relaxes the body and mind, reducing physical tension and mental stress, which are two common barriers to restful sleep. After a sauna session, your body naturally cools down, a process that mimics the temperature drop that happens before sleep and signals your body that it's time to rest. This helps to support a healthy circadian rhythm, which regulates your sleep-wake cycle. A study published in Sleep Medicine Reviews (2018) found that passive body heating, such as sauna use, improved both depth and duration of slow-wave deep sleep. With deeper rest comes better mental alertness and more energy during the day, as well as improved mood and cognitive performance. Many sauna users report that regular sessions help them unwind in the evening and wake up feeling more clear-headed and energized, making sauna use a simple but powerful addition to a healthy sleep routine.