Question: what are the chances of someone dying in their sleep?
Answer: In the last and most detailed report of sleeping habits from that series, analyses indicate that men 30 years or older who usually slept under 4 h per night were 2.8 times as likely to die within 6 years as those who slept 7 or 8 h, whereas those who slept over 10 h were 1.8 times as likely to die.