How Do I Convince My Mon to Let Me Sleep on the Couch?

Tell her exactly that. And if she tries to cut u off again say "Mom, i don't appreciate you cutting me off, c'mon just please let me finish! I will go crazy otherwise . ." or sumthin along those lines. You see, sharing a room really does suck so I understand where ur coming from. Tell her that it is starting to affect u both mentally and physically. Tell her about the fatigue, the frustration, the headaches, and all this other stuff u are experiencing (even if it isn't all true). Make sure to tell her that u only wish to sleep on the couch, not move ur whole bedroom out into the middle of the living room. lol, say that ur sure it will help improve with stuff like school since you weren't getting the best sleep before and its important since ur at such a crucial stage in life. Take it slow though with the college sleeping arrangements. Work on her slowly so she can warm up to the idea of ur "temporary freeloading" on the couch. but who knows, maybe you will find that special someone! :D