Melatonin is a hormone our body produces that makes us sleepy. Stop using any electronics at least an hour before bed because the light from the gadgets makes your body stop producing melatonin therefore you won't feel the sleepy effects from the hormone.
The hormone melatonin, which is secreted by the pineal gland.
Pineal gland, which secretes melatonin
melatonin
Melatonin
Melatonin
melatonin
Circadian
Circadian
Pineal gland
the pineal gland
Pineal gland
Pineal gland
That controls sleep and wakefulness. It is the body's natural clock. It is a biological rhythm or cycle of approximately 24 hours.
Circadian
Each 24-hour cycle of and night is called a(n) zeitgebers!
Circadian can be translated as 'about' (circa), 'daily' (dian). Almost animals I can think of (plants, too) are responsive to the daily light/dark cycle of the sun, hence 'circadian'.
Circadian means day night cycles or it can mean anything else like that. Weekday and weekend cycles.