I've also done that, but stopped because every now and then they would die in the middle of the night. Guess it really depends on the situation.I just treated a sick 4 week old chick, and had him in the house for 3 days, but I would let him sleep with his mom and siblings at night while being under a lamp on meds during the day, then finally let him go back out with them all day and he is doing well a few days later.

-Kathy