The results of the experiment have made it clear that a steaming cup of tea or coffee is definitely a better option to an iced drink on a sweltering hot day.

But, when it comes to bedtime, warm milk is the answer.

Not only will it help to cool you down, but this bedtime drink also contains tryptophan, an amino acid that helps you produce serotonin and melatonin, hormones that help you to sleep. And, for vegans, it’s worth noting that almond milk, similarly, is thought to have serious insomnia-busting properties: it’s rich in B vitamins, calcium, iron, zinc, potassium and magnesium, all of which help regulate brain activity, relax the muscles and increase the secretion of sleep-inducing compounds such as melatonin.

If you want to ramp up the sleep factor, though, Moon Milk author Gina Fontana suggests whisking up a milky lavender chamomile concoction.

“Lavender and chamomile have been used for many years to help people snooze. The sedative effect is caused by apigenin, a nutrient that reduces anxiety, leaving you feeling relaxed and sleepy,” she tells Stylist.

How to sleep in a heatwave: 8 expert-approved ways to stay cool and sleep well no matter the temperature