My Sleeping Habit

I have notice that my sleeping habit is unusual, not like the other normal people. Sometimes i can go sleep for fast, sometime i can't go sleep for 2 days. Not normal right ? yeah I have sleeping disorders. Is it because of nicotine? I don't have the the right answer, I've try to find the best way to quit smoking from internet, but until now I'm still smoking. As far as I remembered, I have quit