In my thread "Storm's Coming" I asked about peak beaks, saying that I had looked it up and found nothing. There are Grizz Beaks, yes, but this week's rain in Texas allowed me to get weather experience with all my new gear. I lit upon this idea for weather protection and if it is already known then forgive me for being redundant.
I cut triangles out of some cheap polycro window insulation, which is very light, taped up the hypotenuse, and draped them over the hammock ends between hammock and bug net. The one at the foot is 42" and hits about mid-calf, providing some warmth retention. The one at the head is 30" stops just short of my noggin. Both can easily be pushed to the ends for more ventilation.