I find it amusing, as a side sleeping, toss and turn, claustrophobic, , prone to motion sickness, cold sleeper, when people come up with these things as reasons not to hammock. Never fallen out or gotten motion sickness. Never been cold, once I figured out what I wasn't doing correctly. Never had issues with comfort or being bent like a banana. There are more comfortable positions for sleeping than I find at home in bed. When I cannot sleep in my hammock it is due to other things – last Saturday I woke to the pleasant sound of rain on my tarp and lay there listening for a while, warm and snug in my down quilt.
When a trip includes alpine stretches, I pack the 25" wide pad and tarp on the ground when necessary. Under quilts are more comfortable, but the pad works ok with my double layer hammock. I have a tent for trips with extended alpine sections but it feels confining.
Last Saturday, my companion whined about being trapped in his tent instead of being able to watch the thunder shower. I invited him to sit with me under my tarp. We boiled a kettle for tea and snacked while the rain fell. Seven years and I still vastly prefer the hammock in inclement or cold weather – less confining and far more comfort. A full bugnet lets me sleep without a tarp on fair nights – debris from trees bounces off it. Oh, it works on bugs, too. Have had marmots run right under me. I get out of the hammock to chase off the bears much more quickly than the tent dwellers do.
So my experience has been pretty much the opposite of the expectations of others, including the guy who kept nagging me about how cold I would be, who rolled up the next morning and bellowed "you were cold, werncha!" Nope, sorry. I would have sold it all years ago if it were not more comfortable than tents have ever been.
My dog sleeps on her ccf pad under me – she is a nuisance in confined spaces, but does great being near but not on me. I loan her my jacket or she wears her fleece sweater if it gets really cold.