What’s The Best Time of Day to be Creative?

I don't know why, but I have also found this to be the case:

What Wieth and Zacks found was that strong morning-types were better at solving the more mysterious insight problems in the evening, when they apparently weren't at their best.

Exactly the same pattern, but in reverse, was seen for people who felt their brightest in the evening: they performed better on the insight task when they were unfocused in the morning.