How Much Sleep Do We Need 1. The result of lack of sleep ■ Irritable, groggy and exceptionally(1)______________ 2. Experiment: ■ Sleeping time: 8 hours Exhibited fewer attention lapses ■ Sleeping time: 6 hours Reacted (2) _____________to a drunk person ■ Sleeping time: 4 hours Suffered (3)____________ falling asleep 3. How to recover? ■ Short-term sleep deprivation Several nights of (4)___________ sleep ■ Weeks-to-months sleep deprivation Require(5) __________time to recovery ■ Months-to-years sleep deprivation Recovering time is(6 ) ___________ 4. How much sleep do we need? ■ Ideal time (7) ___________hours in average ■ Sleep less than 7 hours Heart disease,(8)______________and diabetes (9)_____________ higher risk of death ■ Sleep more than 8 hours Heart disease, obesity and diabetes 30% increase risk of mortality (10)___________play a role in variation of the sleeping time needed