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Serotonin causes the Pineal Gland to secrete Melatonin. Melatonin helps regulate your sleep cycle.
Serotonin is a neurotransmitter (brain chemical) responsible for feelings of well being and happiness. Serotonin is found in the central nervous system, where it regulates mood, appetite and sleep, and in the gut, where it regulates intestinal movements. Symptoms of serotonin deficiency include depression, anxiety, irritability, perfectionism, low self esteem, repetitive thoughts and insomnia. Depression that's worse in Winter is due to serotonin deficiency. Here is a <a href=http://www.gethelpfordepression.info/Tests/SerotoninTest.aspx target="_blank">Serotonin Deficiency Test</a>
Exposure to bright light causes the brain's pineal glad to decrease its production of the sleep-inducing hormone melatonin in the morning and increase it in the evening. In a nut shell, melatonin helps you sleep and most people don't sleep when light is shining.
The short answer is, it increases melatonin production which causes sleepiness.
Serotonin.
Serotonin plays a role in the modulation of mood, sleep, appetite, anxiety, and sexuality. When there is an imbalance in serotonin, medications known as serotonin reuptake inhibitors may be considered.
Tryptophan is an essential amino acid that has been referred to as a natural sleep aid. Tryptophan is a biochemical precursor to serotonin (a neurotransmitter) and melatonin. (a neurohormone). Both serotonin and melatonin are related to calmness and drowsiness.
There is no one neurotransmitter that causes sleep. Acetylcholine, norepinephrine, dopamine, and serotonin are all known to be related to sleep in some way.
gamma-amino butyric acid
Turkey has an amino acid called tryptophan, which helps the body produce serotonin, a chemical that plays a key role in sleep.
Definetely get some naturally sourced 5-HTP to help with serotonin production. This will help with mood, sleep and adrenals.
Stress causes no sleep