What to do when you're overwhelmed

Today was a really long day, and I am totally overwhelmed. So what am I going to do?

I am going to get some separation from my work. I think getting a fresh perspective is the best thing we can do. Work as hard as possible to get some margin, instead of always letting work drip in.

Where can you find some separation today? What expectations can you let go of for the next 24 hours and return refreshed?