![]() “On a cellular level our bodies are functioning as they’re meant to: Our bodies interpret light as a sign of when to be awake, and it regulates our energy levels, metabolism function, our appetites, immune function, and even balances our hormones,” says Michael Hamblin, PhD. (However, if you have a circadian rhythm sleep disorder, you might feel fatigued during the day and awake at night.) When it’s working properly, your circadian rhythm isn’t just about maintaining shut-eye sessions: It also helps keep your cardiovascular system, immune system, digestive system, and other bodily systems in check. When it’s dark, our bodies release melatonin, a hormone that helps us sleep. We feel awake and alert when the sun rises. Humans evolved to have this 24-hour cycle in sync with the light that reaches Earth. ![]() We all have an “internal clock” called circadian rhythm that determines when we feel sleepy and when we feel alert. Vitamin D is essential for the healthy functioning of your body, and a lack of vitamin D is linked to depression - although, as this review points out, it’s not clear if a vitamin D deficiency causes depression or the other way around.īut there’s another way the sun affects our brains: our circadian rhythm. You probably already know the sun is a great source of vitamin D. ![]() Let’s back up: How exactly does the sun affect our brains? ![]()
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