Which from endocrine glands is responsible for a regulation of sleep?
hypothalamus
adrenal glands
thymus
pineal gland
The pineal gland is a small endocrine gland in the vertebrate brain. It produces melatonin, a serotonin derived hormone, which affects the modulation of sleep patterns. Melatonin is sold over-the-counter as a  sleep aid in the U.S. and Canada.
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hypothalamus
adrenal glands
thymus
pineal gland
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