The body changes Serotonin into melatonin. Melatonin is called the body's own natural sleeping pill. It plays a key role in the sleep cycle by helping you fall asleep. Low melatonin levels can cause sleep-onset insomnia.
This is how our body utilizes melatonin in controlling our sleep:
- Melatonin is stored in the pineal gland inside the brain.
- The pineal gland releases melatonin only during times when the level of light is low. Practically speaking, this means that melatonin is secreted only at night, while you are asleep.
- In the morning, when you open your eyes, the presence of light is a sign to your brain to shut down the melatonin production.
The pineal gland is like a "third eye", a small organ hidden within the brain. Hindu philosophy refers to a "third eye" that "sees" more deeply and truly than the other two. One of the jobs of pineal gland is to respond to changes in light and dark.
The pineal gland helps govern circadian rhythms - the biological rhythms that take place over a day, such as the sleep-wake cycle. This may be one of the reasons why it feels "natural" to sleep at night.
The Pineal gland is believed to use melatonin as a "messenger" to "tell" other systems what to do. Several studies suggest that melatonin induces sleep without suppressing REM (rapid-eye-movement or “dream”) sleep, as sedatives and other artificial sleep aids do. Travelers have started using melatonin to "reset their clocks" after flying across one or more time zones, and some studies seem to confirm melatonin's ability to combat jet lag and restore restful sleep patterns.
In several studies, supplementation with melatonin has been found helpful in inducing and maintaining sleep in both children and adults, for both people with normal sleep patterns and those suffering from insomnia.
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