I'm 17 and since I was in the 4th grade I was having these weird sensations in the lower half of my back that would make me jerk upward or twitch. Because of this I want able to sleep at all. I would stay up late and I would even try sleeping sitting up and it worked but if I laid flat on my back I would get the feeling again. And it comes every so years like I'll have it one summer and then I wouldn't have it for 2 years.... I just got it again and its bothering me...