Yeah, one night may not ruin the routine, but one night may lead to multiple nights and that may ruin it (happened w/ us)... but we forced the crate back into the routine... now he sleeps with us almost all the time, but we sometime use the crate still because when we leave him at the sitters (my sisters) she doesn't let him sleep w/ her so its good to keep him in the habit of using the crate. Sometimes he'll even jump down and climb into sleep himself.
