I regulate your sleep and wakefulness, influenced by light yet unseen. What am I?
Category: Science · Difficulty: expert
Hint: I synchronize your internal clock with day and night.
Answer
Biological clock
Explanation
Circadian rhythms control the sleep-wake cycle, responding to light-dark patterns, influencing various physiological processes.
This is a expert science riddle — one of the harder riddles here. The answer is Biological clock.
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