Sleep often eludes me... How about you?

After ARDS, I often find that sleep eludes me. Sometimes I am so tired and I may fall alseep early, but then, in the middle of the night, I lie awake. Of course, in the morning, I wake up tired and continue exhausted all day. I admit it is a big problem. And the strangest thing is that post ARDS, I have never had a nightmare even though initially, I had trouble falling asleep because I would have recurring thoughts relating to my hospitalization and the last five weeks in the hospital.
Now, I cannot tell you why this is still a problem but it is...