<human>: Can you give me the gist of the text in a nutshell?

I've been dating my girlfriend for 4 months now... everythings going great so far. I've met her parents multiple times, her mom adores me, and her dad is okay with me (typical teenage girl father?). I hang out wiht my girlfriend till bizarre hours at night (4-5AM). Her parents don't mind when she stays out so late, however they will not let her sleepover. This might have something to do with their religion (fairly religious) or because they don't really know what my girlfriend does with me. I was just wondering if there is anyone to make paernts more open to having her sleepover? I know it's a parental thing to do and I shouldn't force it, I was just wondering if more time, or getting to know me more would change any opinions?
<bot>: Is there anything I can do to change my girlfriend parents opinion about letting her sleepover? or will it just happen over time/when she gets older