Worst habits?

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I was writing a response to this blog about how turning the light off when you are on the computer is bad for your eye sight. While responding I realized that was a habit I have had for a long time and never have been able to break even after my mother saying I should know better =) I realized that we have little habits we do and probably do not even realize them. My best friend told me that I move my feet ihn rythem when trying to go to sleep. She runs her fingers through her hair, my mother takes her leg and runs it up and down your calve. Most people have habits when they are trying to sleep, daily habits, and habits purtaining to certain things. With daily habits I have defiently noticed many. I bit and pick my lips very bad. I can not help it, nothing even has to cause it but when im nervous or scared it is worse. My best friend bites her nails which is a very common habit. Then there are habits that you do in certain situations such as driving, have you ever noticed the way you drive, or the way you sit, or even habits with your speech or daily conversations. Its crazy we develop habits or even habits we pick up from being around someone else. What habits have you noticed about yourself or other people? What's the craziest habit you ever heard about or seen? What's a habit you just realized you do???