Thank you for the welcome and the responses!

I don't drink coffee, tea, soda or any caffiene whatsoever. I also don't smoke, so I know this isn't related to those things.... Seems like it happens when I'm dealing with something stressful, even if I don't think I'm feeling stressed about it. However, seems like it started happening after I started taking Lamictol a year ago, but it gets worse when I miss a dose. Could it be medication related?

It is quite noticable.