These creatures have evolved a range of adaptations to navigate and hunt in the dark. Some, like owls and cats, have large eyes that are sensitive to low light levels, while others, like bats and dolphins, use echolocation to navigate and find prey.
When the sun sets and the light begins to fade, the SCN sends signals to other parts of the body to start producing melatonin, a hormone that promotes sleepiness and relaxation. As the night wears on and the darkness deepens, our bodies continue to produce melatonin, helping us to stay asleep until the morning.
The answer lies in our internal biological clock, also known as the circadian rhythm. This complex system is regulated by a small group of cells in the brain called the suprachiasmatic nucleus (SCN), which responds to light and dark signals from the environment to synchronize our bodily functions with the 24-hour day-night cycle.
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