i have to live in the living room/entryway?

my (18F) brother H (16M) kicked our youngest brother B (14M) out of their room a few years ago. it's a medium-sized room and can definitely fit two people, but when H started to hit puberty he became irritated, irrational, and impossible to reason with. he kicked B out of their room and now B lives in the small, public space between the stairs to the second floor and the front door. he sleeps on a small couch and his desk is positioned so everyone can see what is on his computer 24/7. now that summer has hit, he sleeps on the couch in our living room.

i can't imagine what these past few years have been like for him. he has no privacy, not even a bed to sleep in.

this september i leave for my gap year in morocco. i am spending a year studying arabic through a government program/scholarship. after this academic year, i have one last summer before i leave for college in another state (im american.)

the problem is that when i leave for morocco, B rightfully gets my room. he'll finally have a bed and privacy and everything he has been missing for like three (3) years. but when i come back from morocco i have to live on the couch for four months before i leave for college. besides this couch, i have nowhere to go. i'll be homeless. i don't know what to do. everyday i'll sleep in an open space where people walk through day and night?

ik this sounds so bratty and spoiled but this feels like such a big deal to me. i have narcolepsy and getting sufficient sleep is crucial and i js genuinely don't know how my brother endured this. is there anything i can do? does anyone have a solution??