We have the same problem. 

raisins mom

We have the same problem.  Raisin does not make a noise.  If we up he will go up to the door and sit but when we asleep he will just go in his crate, not even a whimper.  I haven’t tried it but I wonder if teaching him to tap the bell when he wants out would work?  Something to consider because it would wake you up. Good luck.