Apparently you are supposed to get a torch and have a little look at their wee butts when they are asleep, you might see the little buggers congregating.
lol thats just too funny. if we even thik about breathing when we walk past his room while he is sleeping, he wakes up. there is no way I'd get within a foot of the cot.
I will have a look first thing when he wakes though, apparently thats the next best time to check.