It's been about 8 months since I have experienced this fear of sleep. It started when an acquaintance died of her sleep (cardiac arrest I supposed). I have known that she has some history of illness which alleviates the cause of death. With this information, I was not still able to convince myself that it was an isolated case and what happened to her won't mean will also happen to me. Out of paranoia I even went for a medical check up just to make sure that I am in good health. But still, lingering thoughts about fear persists every night before bed. It even affected some of my daily activities. I even gave up my part of my thesis writing to focus on this but still the urge of going back to that thinking really kills me and massively affect my everyday work. Being a teacher, it's hard not to get enough sleep and face your students the next day. I went to a psychiatrist once and gave me some advice. He even prescribed some meds which I took for some time. I tried to solve this problem as natural as I can. reading posts on the internet about Mindfulness and etc.
I hope I could get some good and useful advice from you guyss. Than you very much and hope to hear from any of u soon. Let's all fight together on this! God bless