A lot of what we know about sleep today has only been investigated in the last 30 years or so, and much of this research has proven that a good night’s sleep isn’t a luxury; it’s a necessity. As demonstrated by devastating events caused or influenced by sleep deprivation, like the Challenger explosion in 1986 or the Exxon-Valdez spill in 1989, not getting enough sleep can have serious consequences, both for individuals and for societies. So, because sleep is so...