1. Before the invention of the lightbulb people slept during the hours of darkness.
2. Because doctors who aren't on hinght call are more sleep deprived than doctors working during the day.
3. Yes. They are very effective in restoring our energy levels and making us feel happier, etc.
4. 6.2 hours a night (during the week). Yes
5. Because they often take important decesions when they are not tired.
6. The hours of sleep that we owe to our body (i.e. the extra hours we need to sleep to feel at our best)
7. Caffeine.
8. Driving when you are tired isn't against the law , but it's just as dangerous.
9. They sleep less because they have more reasons not to sleep (work, the iNternet, TV, 24/7 society)
10. It shouldn't be hot, used as an office, or for watching TV.
11. Tired engineers made very serious mistakes with catas trophic consequences.
12. 8-8.5 hours.
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