Definition of melatonin
: a vertebrate hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms
Recent Examples of melatonin from the Web
One of the key markers of the circadian clock is melatonin.
So with irregular sleepers, melatonin is released later in the night, pushing the circadian clock later as well.
Plus, screen time before bedtime (or more specifically the blue light that screens give off) actually suppresses the body’s production of melatonin, the hormone that helps your body drift to dreamland, and has been linked to worse sleep quality.
Magnesium, with muscle-relaxing properties, is also essential for melatonin production and sleep.
Further, blue light from electronic devices may impede the release of melatonin, which people need for sleep.
At the same time, experts conclude that the release of oxytocin reduces stress levels, and its accompanying melatonin signals the body for a time of rest.
Blue light is known to suppress melatonin production, a hormone that is key to the sleep-wake cycle, known as the circadian rhythm.
Most experts still recommend shutting down your devices an hour or two before bed, and as one expert told our colleagues at Macworld in March 2016, preventing melatonin suppression is only a part of the issue.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'melatonin'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of melatonin
Greek melas black + -tonin (as in serotonin)
First Known Use: 1958See Words from the same year
Medical Definition of melatonin
: a vertebrate hormone C13H16N2O2 that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms
Learn More about melatonin
Britannica.com: Encyclopedia article about melatonin
Seen and Heard
What made you want to look up melatonin? Please tell us where you read or heard it (including the quote, if possible).