It goes without saying that we all have different sleep schedules. If you want your mind to operate at its best, you need to make sure it gets enough rest. This infographic covers the bedtime habits of some of the greatest minds in history:
As you can see, these great folks did not pull all-nighters all the time to come up with their brilliant ideas.
[Source: Daily Rituals: How Artists Work, by Mason Currey / NYMag]