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How much sleep did you get last night? For many Americans, that answer is, "Not enough."

United statesKim scarfeMark wuTimeboth weybehMindy basaraRaya wehbehGreater baltimore medical centerNational sleep foundationTeam reporterJohns hopkins medicineDaylight saving timeboth weybehSpecial seriesDaylight savingDr mark wuR raya wehbehOw much sleep is enough