melatonin
melatonin — 名詞
1. a natural substance your body makes, mostly at night, to tell you when to feel s
褪黑激素
人體自然分泌、調控睡眠的激素
a natural substance your body makes, mostly at night, to tell you when to feel sleepy and when to wake up; it is also produced artificially and sold as tablets or liquids to help with sleep problems such as jet lag or insomnia.
Hiro takes a melatonin tablet every night when traveling across time zones for work.
Hiro 每次出差跨時區時，晚上都會服用一小顆褪黑激素錠。
collocation: take a melatonin tablet / pill for jet lag
Antonia's doctor suggested melatonin to help her sleep after working night shifts at the hospital.
Antonia 的醫生建議她試試褪黑激素，幫助她在醫院值完夜班後入睡。
use for shift-work sleep disorder
Your body naturally produces melatonin when the sun goes down and the room becomes dark.
太陽下山、房間變暗之後，身體會自然產生褪黑激素。
Beatrix bought some melatonin gummies to help her young son settle into a new bedtime routine.
Beatrix 買了一些褪黑激素軟糖，幫她年幼的兒子適應新的就寢時間。
- sleep hormone
everyday, non-technical term used in health articles and product descriptions
文法句型
no article when referring to the general substance
用法筆記
As a countable noun it usually refers to the supplement form ('a melatonin', 'two melatonins' — informal). In scientific writing it is always uncountable.