Help, what should I do

So my family and I are on a vacation, so we are currently staying in a hotel and the room just like most hotels just has 2 big beds and not much space but this one also has a small room with 2 little bunk beds. so it’s like midnight, my mom and dad are both sleeping on the 2 beds while my sister and I are in the smaller room, (I’m on the bottom bunk) and I’m trying to sleep then suddenly i start to hear a lot of really quiet moans, so I look up at my sisters bunk and above me I see her masterbating. it’s been going on for an hour and a half now, and she’s still going.

What should I do, I don’t want to make it really awkward but I also don’t wanna keep listening to this all night long.

PLEASE HELP ME.

She’s 15 btw

Edit: yes it is still going on and making noise hasn’t helped

Edit2: ITS NOW OVER and shes doing it in the bathroom but I do feel like this will keep happening

Edit3: I’m staying here for 2 weeks btw