got a lovely rescue cat a few monyhs back. all fine but one major issue:
he is in at night (and we don't have a cat flap - not feasible at all unfortunately) and is walking freely around the house. by 3 or 4 am he starts waking us up by miaowing loudly. no idea if he wants food (shouldn't be hungry) or wants out. I end up letting him out most nights only for him to howl again an hour later in front of the bedroom window and I do then let him in. he is incredibly noisy. neighbours have also commented 
any ideas how to break that night time miaowing? it's really affecting our sleep.