My greatest rationalizations come when it is late at night, the lights are on, I'm wearing shoes, I'm sitting in a chair and I'm JUST SO TIRED!
Staying right here will be just fine. I am listening to the TV with my eyes closed, I'm not going to fall asleep. Even if I did, I am tired enough that it will not bother me to have a light shining directly in my eye.
I next wake up at 4 am, rip off as much clothing as possible, tear off my shoes, turn off the light and convince myself that laying down on the floor will be even better than walking the two flights of stairs to my bedroom.
Who needs restful sleep? Who needs to wake up not in pain?