Verbs/verb phrases, take a nap, toss and turn, fall asleep, allow, result in, incorporate, avoid, strengthen, enhance, Nouns, eyelids, a study, a shift worker, schedule, parenting, muscle recovery, endurance, environment, heavy meal, implications, Adjectives, refreshing, groggy, disoriented, recharged, essential, Idioms, a slippery road, a short-term fix, a double-edged sword.

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