the cocoon or canyon effect can be reduced in a couple ways.
one is by hanging the hammock w/ more sag. you'll still have a wall of fabric on one side of your face & the opposite side at your feet as you lay diagonal on the hammock, but this is much better than a high wall on each side.
another option is to add tie outs w/ shock cord (like a HH), or you could add a spreader bar like i'm using on mine.
click on "my gallery" by my name to find more pictures of the spreader bar. i believe you'll find them on about page 7 of my gallery.