"There are plenty of articles offering suggestions on how to outsmart the ingrained drudgery of office life, by taking breaks or moving around. Eventually, though, no matter how many intermissions are built into the day, everyone will eventually have to get around to actually doing work.
And that’s when it can help to have something for people to occupy their hands with. For example, people have been shown to remember information better when they took notes by hand than when they typed them up on a keyboard. One oft-cited study found that doodling also seems to boost memory; its author hypothesized that doodling might help keep people from daydreaming during a boring task."