bad memories

when i am really really really tired and in my office (or in the subway), like today, and when i have my office door open and hear students and other teachers speak in the hallways or in their offices, i feel like i am in the hospital. it's a very strong memory i have from hospitals, being half awake and hearing people speaking around me, nurses, doctors, visitors... so now, every time i am in this state of mind, when i'm beyond tired and unable to concentrate on things (you should've seen me try to work on my article, it would take me 3 attempts before i could write a word correctly), i feel like i'm at the hospital again...