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/ˌmɛləˈtəʊnɪn/ · noun
A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep and wake and reproductive cycles in mammals..
How exactly melatonin relates to sleep is still not understood.
Melatonin production can be delayed or arrested by even brief flashes of bright light entering the eye, research has shown.
Use melatonin when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Melatonin means A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep and wake and reproductive cycles in mammals..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
How exactly melatonin relates to sleep is still not understood.
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