The last few overnighters (including one this past weekend) I've done have been in the garage with the door closed. I open a window to let some fresh air in. I do this because of the cold or threat of rain (which was the case last Sat. night).
My garage is actually a two-car garage with only one car in it plus the lawn-mower, work bench, gasser, ect. so I have enough room to do this. I make sure there is nothing within three feet of the cooker. When I get up to check on it, I open the garage door to let the smoke clear (It gets really smokey in there with the wood chunks) and I don't have to worry about critters, wind, ect. Normally, I prefer to do it outside but it works for me.
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Mark WAR EAGLE!!