Don't know about the 5 mins, but I found a list of things to do online when I'm bored or just not working...
Go for a walk, have a nap, have a bath, phone a friend, go shopping, watch a movie, read a book, play loud music, visit a friend, make something, tidy up, look at photos, take a trip somewhere new.
Of course, difficult to do if you're in a lab environment... but you can do some of these things virtually... :)
Mostly, I move rooms... I tend to take more than 5 mins, though... more like 15 mins but then I work for longer than 20 mins, more like an hour or so... I do things like take coffee, dream, read a book for a bit, doodle, look out the window, call friends, surf the net (better if you do something specific, though), play mahjong.