How to tame a "sleep crasher"?

i have the sweetest housemate who is also my classmate. we have become really close this year, but lately she has this annoying habit of constantly coming into my room and waking me up to tell me literally the most insignificant things. for example, yesterday she came in and woke me up just to say hi and that she was bored. i have a really busy schedule between school full time and work part time, so sleep can definitely be a rarity for me, and i try to make the most out of the little sleep i do get. every time i mention her coming into my room and waking me up for nothing, she just laughs and i think finds herself amusing. when she did it yesterday, i think i must have appeared clearly annoyed because i was especially exhausted. i tried as nicely as i could to ask her if we could chat when i woke up, but she looked like she was literally about to start crying, which of course made me feel like a total d*ck ahhhh...i mean, once or twice on occasion is cute, but constantly....really?! i just kind of feel like it's total disregard for another person...ahhhh i don't know what to do and hate feeling like a mean person to someone who is really nice! help please!