A member asked:

Is it right that there is a hormone secreted in the night when there is no light which rhytm something ?

A doctor has provided 1 answer

There are many: Hormones that are secreted during the night that have higher levels in the morning - which is called a diurnal rhythm - such as testosterone and growth hormone. You may be referring to melatonin which is make in the pineal gland and helps control sleep and wake cycles.

Answered 10/7/2013

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