So... Where do the teachers sleep?

That is a good question. Well, we know the Heads of House (or, at least McGonagall) don't sleep to far from the common room; how many times as McGonagall rushed in seconds after something major happened at night?

I'd assume the teachers room are close to their office, or maybe even attached to it.

The professors never sleep.

O__O

well they could magicly make a bedroom appear whenever they need one or they have one behind their office

They have one with their office!

I figured they had a room branched off from their Office/Classroom. But really you have to think that only maybe 30-50% of the entire castle is mentioned in the books. There is so so so so much more to the castle than we are told about. They could have an entire house sized space to call their personal home. Because I do believe they stay there year round, still living there after the kids go home.