Melatonin is a characteristic hormone made by your body's pineal (pih-knee-uhl) organ. This is a pea-sized organ found simply over the center of the cerebrum. During the day the pineal is inert. At the point when the sun goes down and obscurity happens, the pineal is "turned on" by the SCN and starts to effectively deliver melatonin, which is discharged into the blood. Normally, this happens around 9 pm. Subsequently, melatonin levels in the blood rise strongly and you start to feel less alarm. Rest turns out to be all the more welcoming. Melatonin levels in the blood remain raised for around 12 hours – all as the night progressed – before the light of another day when they fall back to low daytime levels by around 9 am. Daytime levels of melatonin are scarcely perceivable.