Why Does Anxiety Keep Us Awake All Night?

Why has sleep become one of the hardest things we can do? Millions of people suffer from insomnia, waking up every hour, or falling asleep to wake up and then to only stay up. In my case, I suffer from what's called, "myoclonic hypnic jerks and seizures." This is purely from anxiety. I have been a couple of sleep studies to show that nothing medically is wrong with me. In a strange way, I wish they did find something wrong with me so that I can at least address it. The thing is, with this unknown "mystery diagnosis" that stems from anxiety, it is the hardest thing to fix. It's like a doctor telling you "it's just a spider bite." They basically just labeled "anxiety" onto my chart and sent me off with a prescription of Klonopin that I never filled out. I don't have sleep apnea, nor any other type of sleeping disorders. So why is it so hard for us to fall asleep or to even stay asleep? Whether people admit to this or not, anxiet...