How can you explain biologically why we are sleepy ? I find even people who have normal sleep order also feel sleepy often....
Melatonin.quetzalcoatl9 said:It has been determined that the circadian cycle of sleep is determined by this gland and it's production of serotonin.
the pineal makes serotonin, then serotonin gets made into melatonin which then gets released from the pineal gland. the pineal can make an overproduction of serotonin, which does not get converted into melatonin.hitssquad said:Melatonin.