Definitely bring a sleeping bag. For even more warmth, line your hammock with something like this http://www.amazon.com/gp/aw/d/B00KWR2FMC/ref=mp_s_a_1_4?qid=1444045897&sr=8-4&pi=AC_SX110_SY165_QL70&keywords=tarp+survival&dpPl=1&dpID=51EmTN7btOL&ref=plSrch