(flickr/nmarkelz)

...even worse than Facebook! The worse thing for your relationship is the lack of sleep! A study suggests that the lack of sleep tends to prioritize ourselves over our partner and become complete jerks. We forget the little
things, like saying "thank you." The study, out of UC Berkeley found that if "you slept like a baby, but your partner didn't, you'll probably both end up
grouchy." Source