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