noun
melatonin
mel-uh-TOH-nin/ˌmeləˈtəʊnɪn/
A hormone that helps regulate the sleep-wake cycle.
Melatonin helps signal to your body that it is nighttime.
Etymology
“Black” is paired with an ending taken from serotonin. The name may refer either to secretion being inhibited by sunlight or to changes in skin color in certain reptiles and amphibians.
In context
melatonin is oral it's helps with insomnia it's used as a sleep enhancer
More examples
- Bright light at night can suppress the body's production of melatonin.
- She asks her doctor whether melatonin might help with jet lag.
- Melatonin levels usually fall as morning approaches.