It happens to a couple of my mates quite often too. It is nothing to worry about! I think one of the main causes, as Heirophant mentioned, is lack of sleep/sleep deprivation. Just follow his advice and you'l be fine!
__________________
[img]\"http://img.ranchoweb.com/images/ladyzekke/dragonwater2.gif\" alt=\" - \" />
|