We've just moved DS (8weeks) into his own room into a cot for the same reason, plus he's a noisy sleeper. We've got a 12yr old monitor borrowed from family and that picks up movement noises too - it's amazing how much noise he makes with a nappy, the matrass protector and his wrap on before he even starts to cry and he gurgles away to himself too. To make the transition easier on all of us we started by putting him in there for his day sleeps to start with and then this week at night as well. Actually considering not using the monitor in a few weeks because we still hear all his noise and DH has trouble falling asleep with it... once asleep, different scenario - typically doesn't hear a thing!