I strained a back muscle one time trying to get my sleeping bag up around my shoulders. I twisted and turned the wrong way. I've since gone to using the SB, but as a top quilt.
It is possible to do back damage in any new situation you are not used to. Our bodies take awhile to adjust to new postures for anything, but particularly sleeping. You may have damaged your back by a combination of your body subconsciously trying to get into it's 'normal' sleeping position. This in combination with recovering from a bike ride, as well as a slight draft during the night might have combined to cause some damage.
I would suggest that you try to condition your body by starting out with naps in your hammock at home. 1/2 an hour, then an hour, then 2 etc. until your body gets used to the idea of sleeping in a different position.
Another alternative is to look for a hammock with a flatter lay. Maybe a bridge hammock, or a Hammock Bliss Sky Bed (which is my choice).
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