Key "always" remember:
Use a reflective shade in the bottom to insulate hammock and reflect body heat!
- Shade on bottom
- Second sleeping bag on that
- In my sleeping bag on top
Wore: Thin thermals + my sweat pants. Did just fine.

If it REALLY got cold my next two steps would be
1) Lower the ridge line and put a tarp over it to trap warm air
2) I would get in my heat sheets bivy bag. Super warm, although one wakes up a bit moist...