This is happening to me too. I was up for 72 hours straight due to fear of not being able to fall asleep. I finally fell asleep while taking remeron and klonopin together... but I only slept 3 hours. I am like a zombie right now. I can't get my mind to stop thinking of not being able to fall asleep and the thought gets me into a panic. I fear of death from sleep deprivation. No matter how exhausted I am, it's like I lost the ability to fall asleep. I'm scared. My doc just put me on lexapro hoping over time, it will help me.