I've been taking Venlafaxine for more than 1 year.  
I find that sometimes, when I am lying in my bed, my leg kicks upward suddenly, paired with a very peculiar feeling from my brain.  
It is really hard to describe; I was trying so hard to sleep, and then suddenly a neuron misfired and I was very aware for a brief moment.  


Also during the daytime, when I am focused on study, I feel a tingly/zappy sensation slowly crawling under my scalp(or on my brain - IDK).  It usually lasts around 3-10 seconds, unlike the first case, which is only of split second.