I've been going through the absolute worst period of insomnia in my life these past few weeks (since December 18th). I have no idea what's causing it. I haven't been stressing out lately and up until then, my sleep cycle was perfectly fine and normal. I just woke up one morning and discovered I couldn't go back to sleep on my own. And since it occurred on a weekend, I spent most of 3 days wide awake before being able to see a doctor. I hate it.