BEDTIME == ?

Here's a question.

What time do little kids go to bed?

My next-door neighbors (who share a wall with our townhousey/condo thing) have a little kid. I'm not sure how little (I've never seen him/her), and maybe that's extremely relevant to the question, but maybe you guys can give me a range here?

Basically I just want to know how late in the evening I can play my guitar and sing. I feel bad doing it anytime after 9pm now, whereas before, with the previous neighbors, 10pm was my self-imposed cutoff. My room is one room away from sharing a wall with them, but I'm a pretty forceful singer/guitar player, is the thing, and I don't want to keep any little kids from getting their sleep.