How to avoid arguing with your mom about sleeping over at you girlfriend's house?

I study far from home, and return home every weekend.
Recently I started dating someone and I would very much like to spend at least one of the nights during the weekend with her at her place.
As I am not ready to come out in front of my mom I struggle to explain why I want to spend nights with her and my mom insists that I sleep at home every night I'm home from school.

I came up with some excuse once or twice why I spent the night and didn't return home but I hate lying to my mom.
Any suggestions on how t o approach it?

How to avoid arguing with your mom about sleeping over at you girlfriend's house?
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