When we were renovating our house (and had no doors downstairs!), my cat used to miaow a lot outside the bedroom to get in as well, but not enough to wake us up. Now that we have our new doors downstairs, we just leave her in the sitting room, where she sleeps on one of the couches (on her blanket) and also has the kitchen to wander in and out of. She seems happy enough and it's what she's used to now. Two rooms is plenty IMO. I put her out in the morning then...
I'm on the kitten adoption website as well so would recommend it for any info re your cat's habits...
M