I had a rough re-entry into camping/backpacking after years of ... well, not. I had a tent and thermarest. I got no sleep. I tried, oh how I tried, to get used to it. It wasn't noise, or fear of things that bump in the night. The pattern, time after time, was lying awake allllll night, staring at the ceiling of the tent. Tossing, turning, falling asleep for a few minutes, waking to find a limb off the pad or the mummy bag twisted up again, or the hood in my face, or I'd rolled against the side of the tent. Around 6 am or so I fell asleep out of sheer exhaustion only to wake again as the sun heated up the tent. My joints were killing me. My hips got sore from trying to sleep on the pad. My claustrophobia wasn't liking it AT ALL. Hate mummy bags. No ipod or meditation will change that.
I got a Hennessy. At first I used the good ol' blue ccf, then got an underquilt. Absolutely solid sleep. For a while I had trouble getting the actual hang figured out - some of the time, it wasn't so comfy. But my joints didn't ache. My hips didn't bottom out, and I was warm and off the ground.
I got a Blackbird. Not a single hang has been less comfortable - less than ideal, yes, I've put the suspension to the test with crazy hangs, extending one strap all the way and cinching the other up to the whipping to avoid underquilt-tearing branches, or shoving the straps up trees high over granite boulders. But I feel even less claustrophobic in it than in the Hennessy, and eight to ten hours of sleep are my new norm.
Figuring that I'd get to spend at least 2/3 of the time in the hammock, I got a NeoAir to go with me on the JMT just in case my group ended up camping in areas inconvenient for hanging. For the first time since getting a hammock, I slept on the ground - it worked, I slept about five hours or so - not ideal but better than before. The NeoAir is 2.5" thick, which I guess is enough. Still going to hammock whenever and wherever possible, as I go out to relax and rest, not death march through the wilderness.
I don't know why the OP can't sleep - he hasn't responded to any appeals for more info on the forums he's posted to (there are two others I'm aware of). Hopefully he's found some help in what we've posted.