Circadian Rhythm Terminology

noun a condition of body and mind that typically recurs for several hours every night, in which the nervous system is inactive, the eyes closed, the postural muscles relaxed, and consciousness practically suspended

verb to rest in a state of reduced consciousness and reduced metabolism

adjective relating to or used for sleep

adverb in or into a state of sleep

• It is important to get enough sleep each night to maintain good health.
• I'm so tired, I need to catch up on my sleep this weekend.
• I can't hang out tonight, I need to hit the hay early and get some good sleep.
• After a long day of work, sometimes all you need is a good book to help you sleep.