I've heard that as we get older we have a harder and harder time getting the sleep we need. It's hard to fall asleep. Waking up is what's easy. Then it's even harder to fall back asleep.

Apparently I've reached that point, because I feel lucky if I can manage to get five or six hours sleep. Most times it's less. Sometimes a lot less. As an example, here's my sleep from last night...

   
Three hours and nine minutes. I should have taken a nap when I got home from work, but I wasn't tired.

No idea how that was even possible.

How can I function on three hours sleep?