<human>: Condense the text into a few key points

My Girlfriend and I live together and because of our work and school schedules, we keep very different sleep cycles (she goes to bed several hours earlier than I do). Every night she will start to mention how tired she is and I'll suggest she go to bed. Instead she will stay up for a few more hours continuing to mention how tired she is and saying things like "I really should get to bed." But without fail she will fall asleep on the couch while I'm still working on homework/watching TV/etc. 

This irritates me as I feel I need to be more quite and still to avoid disturbing her sleep. She says that I do not need to worry about disturbing her sleep and I can act as I would were she not there, however I still subconsciously avoid disturbing her sleep. I've brought it up with her before and asked that she go to bed before she's so tired, but she has not made any change or even agreed to try to make a change. 

She feels that since it is her quality/amount of sleep that is in question it should be entirely her decision as to whether or not she falls asleep on the couch. 

I know this is a kind of silly problem but it has been going on long enough without resolution that I figured it was time for outside help.

Am I being ridiculous in my request? Do I need to just suck it up and get over it or should she go to bed before she falls asleep on the couch?
<bot>: Girlfriend falls asleep on the couch for a few hours every night before going to bed while I am still awake, this irritates me.