Sleep remains one of the most mysterious and precious needs of the human body. Despite years of research and the development of drug solutions, many are still struggling to find a truly restful rest. However, certain habits from the bottom of the ages recall that biology often feeds on simple gestures. Among them, warming up their feet is today an unexpected lever that science is starting to decipher with precision.
This almost universal behavior today has a physiological explanation. When the ends of the body, like the feet, are warmed, this causes the blood vessels to dilation, promoting the transfer of heat to the outside. This mechanism allows the heart of the body to cool, an essential condition for falling asleep. This is precisely what confirm several decades of research, including a 1999 study published in Nature and relayed by The Washington Post, which identifies the temperature of the feet as the best indicator of the falling speed.
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What neurosciences reveal when we warm up
At the brain level, the effects of this gesture are far from anecdotal. According to William Wisden, professor in neuroscience at the Imperial College of London, a warmed skin sends signals of drowsiness to the central nervous system. It prepares the body to slow down, starts the first sleep cycles and promotes a faster transition to the deep phases.
Warm up your feet is not content to cause a feeling of fatigue. This changes brain activity measurablely. A review of clinical trials led by the Dr. Khadijeh Nasiri team for BMC Gériatrics has compiled ten studies on the subject. In nine of them, hot water foot baths have significantly improved the quality of sleep in the elderly. These effects were observed in ten minutes of exposure, with a water temperature greater than 40 ° C.
Even compared to classic sleeping pills, this method is doing well. According to another meta-analysis relayed by The Washington Post, a bath or a hot shower before bedtime would fall asleep nine minutes earlier. By way of comparison, melatonin accelerates the falling asleep of seven minutes, while drugs like Zolpidem (Ambien) do it in ten to twenty minutes. All without side effects.
Good timing to sleep deeply without medication
The effectiveness of this ritual depends strongly on the moment chosen to practice it. Apply heat too early in the day reduces the effects before the brain comes in sleep. William Wisden specifies that the organization correctly interprets the thermal signal only if it coincides with the natural primer of the circadian rhythm. Ideally, you have to warm your feet an hour before bedtime.
There are several simple and inexpensive ways to adopt this evening ritual. You can put on socks, plunge your feet into a hot bowl or take a quick shower before sleeping. In parallel, it is better to keep the room cool during the night. According to the National Sleep Foundation, a temperature between 16 and 19 ° C promotes bodily relaxation. This thermal contrast therefore plays an essential role in falling asleep.
But some harmless gestures can compromise everything. Many people take anti-inflammatory drugs such as ibuprofen or aspirin before going to sleep. These drugs cause vasoconstriction, blocking the natural dilation of blood vessels and thus canceling the benefits of warming. Research cited by Slate also emphasizes that these molecules can disrupt melatonin production, making sleep more difficult.
By betting on a gesture as simple as to warm their feet at the right time, everyone can activate their natural sleep mechanisms. An ancestral habit which, in the light of current data, could of course surpass pharmacological solutions in terms of security, accessibility and sustainable efficiency.
