Cold is a relative thing and I understand that everyone has a different cold tolerance... And that a UQ is the best... However....

I purchased a BB 1.7 DL and I am getting prepared to spend my first night hanging from a tree. I am planning on using this on a car camp so weight is not a issue. The temperature is going to be 90F during the day and 60F at night.

My current plan is to lay on a standard square sleeping bag open with a sheet on top. If it gets cold, flap the part I am not sleeping on over. Has anyone done this and what is the lowest temp that you would do this?? Would this be enough insulation for the bottom??

My thoughts are half of a sleeping bag would be more comfy than CCF but I could be off base. Thanks for the insight and help for successful first hang.