Jason Fried from 37signals:

In all this work, and all the usage, and all the trials, and all the tweaks, I’ve spotted a pattern. Things that look good at the end of the day often don’t look good the next morning.

The end of the day has a way of convincing you what you’ve done is good. The next morning has a way of telling the you truth.

Definitively. I also often look at a design every day after one another, and the more days I open it and still like it, the bigger the chance I’m on to something good.