melatonin

Imagine your body has an internal clock that tells it when to wake up and when to wind down. Melatonin is a hormone, a small chemical messenger, made mainly by the pineal gland in the brain, and it plays a big role in setting that clock. It's like a signal that says, "It's getting dark, get ready for sleep."

It doesn't just affect falling asleep; it also helps regulate your body's natural sleep-wake cycle, known as the circadian rhythm. Think of jet lag or shift work disrupting this rhythm. That's one reason some people use supplements to help reset it. Our bodies naturally make more of this hormone when it's dark and less when it's light, so dimming the lights before bed can help your body follow its normal pattern.

Melatonin is a hormone produced mainly by the pineal gland in the brain that helps regulate sleep and wakefulness. It is not a sedative, meaning it does not force you to fall asleep the way some medicines do. Instead, it signals to your body that it is time to prepare for rest. You can think of it as a natural dimmer switch for your internal clock.

Our bodies naturally produce melatonin in response to darkness. As daylight fades, melatonin levels rise, making us feel sleepier and helping the body get ready for sleep. On the other hand, exposure to light lowers melatonin production and helps us feel more alert. This is why bright screens before bed can interfere with sleep: they can make your brain think it is still daytime.

Melatonin supplements are often used for problems such as jet lag and are also used by some people with sleep difficulties, including trouble falling asleep. They may help reset the circadian rhythm after travel across time zones. They are also studied for other possible uses, but the evidence is still developing.

Melatonin is not unique to humans. Many animals produce it too, and some plants contain similar compounds. So whether we are talking about a person trying to sleep well or an animal following natural rhythms, melatonin plays an important role in helping living things respond to day and night.