A. fall asleep again B. become more energetic the following day C. sleep less than 7 hours D. confirm those serious consequences

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问题 A. fall asleep again
B. become more energetic the following day
C. sleep less than 7 hours
D. confirm those serious consequences
E. suffer sleep problems
F. sleep more than 8 hours
One survey showed that people who habitually______each night have a higher risk of dying.