![]() ![]() This master body clock then prompts the nearby pineal gland to release melatonin, a hormone that circulates in the blood and tells your cells it's time to sleep. Light is detected by the eye, which relays that stimulus to the 'suprachiasmatic nucleus' within the hypothalamus, a cluster of neurons in the middle of the brain. Clocks can be adjusted by an external cue, what biologists call a zeitgeber (German for 'time-giver'), and sunlight is nature's most powerful cue. But assuming Night Shift works in the right way, saying that warmer colors are 'easier on your eyes' is misleading: night mode doesn't reduce eye strain – it helps stop light from affecting the brain.īody clocks have circadian rhythms – internal cycles that last about 24 hours ( circa diem is Latin for 'around a day').
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