What it means
Darkness signals the pineal gland to release melatonin, which helps the body feel ready to sleep; light lowers it. It is also sold as a supplement for sleep problems and jet lag. In the United States it is sold as a dietary supplement, not a drug, so dose and quality can vary between products. Daytime sleepiness and headache are common side effects.
For the nurse
Include melatonin and other supplements when you take a medication history. Teach good sleep habits as well, such as dim light and no screens before bed.
At a glance
| Spanish | melatonina |
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Related terms
endocrine gland
A gland that releases hormones straight into the blood instead of through a tube or duct.
pineal gland
A small gland deep in the brain that makes melatonin, the hormone that helps control sleep.