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bekas [8.4K]
3 years ago
5

The hormone , which is secreted by the pineal gland, influences the sleep–wakefulness cycles.

Biology
2 answers:
Bess [88]3 years ago
7 0
Melatonin is the answer
KonstantinChe [14]3 years ago
6 0
The hormone described above is the hormone Melatonin.
Melatonin is a hormone secreted by the pineal gland in the brain, which helps regulate other hormones and maintains the body's circadian rhythm. This rhythm is an internal 24 hour clock that plays a critical role when we fall asleep and when awake. When it is dark the body releases more melatonin. 
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