How to quit Facebooking?

I'm 20 yrs old bachelore doing my 2yr. Graduation. I had been using facebook since i turned 18 and now, i realised that iam addicted to it. I cant let a day pass without seeing my messages and notifications. My dad says that my behavior had been changed a lot from the past two years, thats when i started using social networking. I stay up most of the nights chatting on facebook and i'm having sleep problems; fatique, eyes sprain and head ache. I want to quit this habbit but iy seems too hard for me. Pleas help!