I have a 8 hour layover Tonite at Bogota airport...arrive at 10 pm next flight at 615....should I just stay in airport ?
You can stay in the airport; it is not the most comfortable unless you maybe have lounge access (the Avianca ones have quiet areas with lay down seats although, I think it closes at 11 ).
If you are past customs, plenty of people seems to sleep on the airport chairs or ground.
A few eateries are open at least by 4 am ( ie corral restaurant - too level food hall) and some of the smaller mum.and pop type shops with drinks and chips etc.
Personally, I would get a hotel close by for a few hours comfort, however for the short time I guess you will need to weigh up if it is worth it.