Your body keeps time with a tiny master clock in the brain, and light is its favorite cue. Bright light tells the clock it is daytime and dials down melatonin, the hormone that makes us drowsy, while darkness turns it back up. With so much of modern life spent indoors under artificial light, that clock can drift, leaving many of us feeling out of sync with our alarms.
A study of more than 1,700 adults in Brazil looked at when people spent time in the sun and how they slept. Those who got more sunlight before 10 a.m. tended to have an earlier sleep schedule, by about twenty minutes for every extra half hour outdoors, and they rated their sleep quality higher. Afternoon sun showed a smaller link, while the midday hours showed none.
The research relied on self-reported habits, so it shows a connection rather than proof, but it fits with what sleep scientists have long suggested: light early in the day helps anchor your rhythm. The good news is that this is one of the easiest, cheapest and most pleasant habits you could possibly add to your day.
Take your coffee outside, walk part of your commute, open the blinds wide the moment you wake or schedule a short morning stroll with the dog. Even on cloudy days, outdoor light is far brighter than a typical living room. Then, in the evening, let things get dimmer so your clock gets a clear signal from both ends of the day.
Source: PsyPost
