My roommate and her boyfriend are ALWAYS at our place, how should I handle it?

I live in an apartment with one roommate, who I generally get along with great, and she has a boyfriend who I also generally get along with, but lately I cannot remember not having them around for more than about 60 minutes. She's asked me before if I mind him spending time here, but I haven't really found it troublesome until this semester, when I don't think he's slept at his place more than a handful of times, and she is constantly working, which I can't really begrudge her for, but going to the library would be nice so I don't feel the need to tip toe around. I've spent the last few weeks in the library, to come home every night to them in our living room, so I'm kind of forced into my room. Lately I've had a little free time and for the first time in weeks have been able t play a little guitar, but since I never have the place to myself, I'm limited to the 30 min or so I have until they come home again, since my room is right in the middle of our apartment, so regardless of them being in her room or the living room, I'm a disruption. We only have a month left here, so I don't want to start any fights or anything, but I'm not sure I can handle walking on eggshells in my apartment from the time I wake up until the time I go to sleep anymore. Any suggestions on how to handle this, or whether I should just try and suck it up for the last few weeks?