I like the spreader bar on this new hammock from Rei. This would stop that annoying thing where the hammock fabric compresses the insulation of your sleeping bag at shoulder-to-elbow and creates a cold spot.
There are several other ways around this eg a wider mat, a pad extender, etc, but I feel that this is genius and could also be done very lightly as a mod (by sewing in two reinforcing patches and attachment points eg some webbing formed into tubes) to any hammock and that the spreader could be as simple as a bent stick which would go up above your head (towards the end of thr hammock so that it did not interfere with getting into the hammock.
Only I am resting a torn meniscus in my left knee today (and that it is raining) stops me from getting out a hammock and the sewing machine and getting to work on it. (You could probably even do it using a couple of tarp clips). I figure I could do this without adding any more than 20 or so grams to the hammock. This rivals that other wonderful spreader idea which allows two people to hang side by side from just one pair of trees under a single tarp. Anyway, watch this space – my knee cannot be stuffed forever (MRI Monday)!
The Rei Flash Air Hammock system
Detail of their spreader bar
Rei Flash Air Hammock System (including mosquito net, fly, etc) available here: https://www.rei.com/product/127400/rei-co-op-flash-air-hammock?cm_mmc=aff_AL-_-5889-_-7185-_-NA&avad=7185_e1262cadd US$199.95 (July 2018) Weight:2lb 12 oz complete
Some other hammock ideas: