Katie Couric's Notebook: Daydream Believers

After all these years, we've finally learned that Sleepy Jean can't cheer up. The reason? All those daydreams.

This falls into the category "there's a study for everything," but it dose make sense: Researchers found people who are frequently thinking about being somewhere else...are more likely to be unhappy.

It happens most often when you're at your computer, relaxing, or just sitting at your desk in the office. The daydreams begin - and suddenly you're skiing in Aspen, snorkeling in the Caribbean - or kissing George Clooney - I mean, just as an example.

The same study found people were happiest when they were focused on one train of thought...engrossed in exercise, good conversation...or sex.

A daydream during that activity would be a bit of an insult to your partner, after all. The good conversation, that is.

So, wake up, Sleepy Jean...and stay in the present. Then you'll know how happy you can be.

That's a page from my notebook.

I'm Katie Couric, CBS News.