How bad is it to take a nap with contact lenses in?

I've always been a good kid and never slept with contacts in, not even by accident. I'm in a bus right now and the ride is like more than 2 hours, I had a long day and I'm super tired and sleepy. :( Obviously I can't take em out right now... so, how bad is it to sleep with contacts in? Will something horrid happen? Or can I just not give a fuck and just do it? #FirstWorldProblems -_-
How bad is it to take a nap with contact lenses in?
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