The airline industry regularly has us take a class that teaches many of the tips of the Wall Street Journal article What Time Should You Wake Up? Probably Not 5 a.m. (That is a free “Gift” link. Please let me know if you have any issues opening and reading it.) Why? Because between commuting, sometimes by air rather than even driving, the odd hours we have the ability to sleep means we have to plan ahead. Closing the office door for a 15 minute nap isn’t an option for us.
The article is pretty high-level, a quick read, but it covers the high points well enough that I thought you would find it interesting.