shut-eye – informal ­n. sleep

antibody – n. a protein produced in the blood to fight diseases by attacking and killing harmful bacteria

identical twins – n. either member of a pair of twins that are produced from a single egg and who look exactly alike

deprive – v. to take something away from (deprivation)

well-being – n. the state of being happy, healthy, or successful

quantity – n. an amount or number of something

brain circuit – ­n. the network of interconnected neurons in the nervous system

beauty sleep – informal ­n. the sleep that someone needs in order to feel healthy and look attractive
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