Night shift workers are more likely to develop heart problems over time.

One of the good things about being the night desk clerk at a seedy hotel in Cambridge, Mass., is that you get to be invisible to most people. If you're looking for a place to disappear and still make a living, this is about as good a place as any.

And especially for all those who risk their lives at night to keep us safe, warm and comfortable, we should all say a special thanks and prayer for safety. Because being up all night is interesting, and sometimes profitable. But it's almost never preferable. And I speak from experience.