Melatonin production increases

When we’re in a sauna, our body temperature rises but once we leave, that internal temperature drops – and that’s the signal to the body to start producing melatonin, the sleep hormone. Melatonin is a key chemical for sleep and earlier you start producing it, the quicker you’re likely to fall asleep and stay in that deep, restorative sleep patch, explains Koskimäki.

Normally, melatonin production is triggered by increased darkness and is responsible for regulating our circadian rhythm. If you struggle to fall asleep at a decent hour – and wake up early as a result – then it’s worth looking at how you might get that melatonin process working slightly earlier or more efficiently. And one way (other than avoiding lots of harsh light late at night) could be to work sauna into your regular wellbeing routine.

But don’t worry about having to confine yourself to a late-night steam; you won’t feel immediately sleepy the moment your body starts to produce melatonin. “Melatonin isn’t a sleep hypnotic or sleep aid that puts you to sleep,” Dr Guy Meadows, co-founder and clinical lead at Sleep School, previously told Strong Women. “Instead, once it’s in the bloodstream, melatonin works by placing the body in a state of quiet wakefulness, which in turn helps to promote sleep.”

Sleep benefits of saunas: how a quick steam in the sauna can help you to drift off quicker, according to science