Can you get addicted to sleeping pills?

I don't think I'm addicted per say but my sister says you can get addicted. Ive been taking them alot at night (just two) Advil pm before I sleep because I feel like I need them too sleep. I didn't use them the other night and I couldn't sleep at all It took me hours too fall asleep then I would keep waking up. So can you get addicted to them? And if anyone has any advise on what will make me sleep easier without sleeping pills? Thanks for all your answers