Thank you everyone for suggestions.
I note a few of you mentioned bivy bags. I already have a gortex bivy bag. Is there a particular bivy bag I should look into?
Someone mentioned the heat reflector. Got me thinking what if I used it to warp the outside of my sleeping bag? I should have tried this during my last trip.
I was also thinking of purchasing a cheap polyester blanket and sewing it together with velcro. Not sure how warm or how well it will wick away wetness but it can double as a throw over.