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How many hours of sleep per night does the average adult need?

Sleep debt is a dangerous condition in which missing sleep adds up until you risk falling asleep at the wheel unless you get some rest. Getting less than six hours of sleep per night triples the risk of an accident. At least 15% of heavy truck crashes are believed to involve driver fatigue. Before a trip, you should get adequate sleep. The average person needs seven or eight hours of sleep every 24 hours to maintain alertness.