God help me, roommate drama advice wanted

[bdk3clash]

I recently took a room in an apartment on a month-to-month sublet basis and am having a very hard time making things work. I work around 8:30 AM to 5 PM and wake up around 6:30 AM. My roommate works nights and generally gets home in the middle of the morning.

I'm admittedly a light sleeper, but generally I get accustomed to my situation and can deal with the normal disturbances a roommate causes when entering, getting ready for bed, etc.

However, my roommate seems to be in the midst of a full-blown substance abuse jag. So she gets home ~3:30 AM, turns on the stereo and television (right outside my room) and becomes extremely belligerent when I politely (I think) ask her to keep the noise down. And then she rails on me about all the things I'm doing wrong as a roommate and this is who she is, and belittles me for taking antidepressants that she saw in the medicine cabinet, calls me a [censored], etc. So, yeah, I'm, like, not getting much sleep. (She'll keep it up until after I leave for work.)

So, believe it or not, a few days ago I came to the conclusion that things weren't working out and that I'd be moving on to greener pastures. I'm not really interested in having this conversation with her in the middle of the night while she's not sober, but it's been several days since I've seen her in a sober state. I'm not interested in a full-blown interpersonal blowup if I can avoid it. I just want to keep things cordial and relatively peaceful until I'm out of here at the end of the month. And getting some sleep would be cool, too.

So, how do I deal?

(I might be ranting a bit. Forgive me.)