T.O.
Hi S.! I've got 2 boys of my own, ages 3 and 5. I have dealt with the wandering-in child in the middle of the night with both of them. At least 2 or 3 nights a week somebody comes and crawls into bed with us. For the most part, for us anyway, it's not a big deal. I have always felt that they come to us because they have a need for SOMETHING, even if they don't even know for themselves exactly what that need is. A drink of water, cuddles after a scary dream, or just comfort that little boys need from their parents. Whatever it is, we just have learned that they have some kind of need that is fulfilled by climbing into bed with us and going back to sleep. Sometimes we take them back into their own rooms and lay down with them for a moment. Sometimes they stay in the bed, and sometimes I kick myself out of my own bed and go find some couch space or crawl into their empty bed. For us, making any kind of situation out of it just isn't worth it.
Especially at their ages, half the time they aren't even fully awake and conscious of what they're doing so punishment is completely unfair. My son's doc has even given me literature in the past about wake/sleep cycles in kids and the state of 'semi-alertness' that is usually when they come wandering in. My 5-year old did this constantly for about 2 years from ages 2-4. It's tapered off to maybe once a month, if that. My 3-year old is doing it several times a week now. I figure it will fade away on its own, just like it did with our oldest. Right now it's just what he 'needs to do' and we treat it that way. If he's still crawling in bed with us at 10, we'll probably have to try something new then ;-) but, for now anyway, we have just learned to save our energy for the daytime... and "all the bells and whistles that go along with a house of boys!" as you say! Good luck and best wishes.