“There are some things you learn best in calm, and some in storm.”     — Willa Cather

I believe this!  And sort of on the same order, don't you find that sometimes when you are REALLY busy at work, your brain goes on 'automatic' and you can punch out that work at record speed.  But if it's really slow, especially for a period of time, it's like your brain goes to sleep and it takes a while to get back in the groove.