My cat has been put in the computer room every night for 7 mos since we got him as a kitten (he's 9 mos old now) and still cries off and on at night. We have tried to let him run free at night a couple times, but he wakes us up too much. We tried again around New Year's and he woke us up 6 times in 1 hour! Since he is Siamese, there is no ignoring his yowl! He goes from room to room yowling and we think he is looking for everyone and trying to get attention. Usually we are all together in the living room or something, so I think at night when we are spread out in our own bedrooms, he gets confused.