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1.
Noun: The deadline for leaving Facebook/Twitter/MSN/homework/alcohol/etc and going to bed.
"My bedline is midnight tonight, no one is allowed to take to me after that time."

"Can't stay long, my Mum's given me a bedline of eleven."
by Galadriel1010 January 06, 2010
 
2.
The time one must finish all their homework in order to get any sleep. This often causes a noticeable decrease in the quality of work turned in.
I had to do my math on the bus because I couldn't get it done before my bedline.
by W.T.Q. January 31, 2010