Fan Death is real. Here's how it happens:
If you subject yourself to sleeping in a room with a fan on all the time... slowly, without your even knowing it, you will become dependent on the noise and air circulation of the fan to sleep. Eventually the dependence i so strong that you'll be unable to fall asleep without the breeze of a fan. Then one day your power goes out, suddenly you have no fan. How do you sleep? You don't. Human beings cannot live without sleep, we go crazy and die in short order if deprived of sleep.
...make sure your fan stays working. Your life depends on it.