Why was i cold in the early hours of the morning? went to the hammock @10. 30 wasn't cold till @ 3am apart from my face which was cold all night?
Very difficult for anyone to say without being there with you, there are so many factors involved. What was the temperature? how wide was your mat? Are you a cold sleeper? Had you eaten? Properly hydrated? Were you damp? Alcohol drunk? Windy? Large meal before bed?
FWIW, I'm cold sleeping at home with a wool blanket underneath me in the hammock, let alone outside.
An obvious over simplification though is that your insulation wasn't sufficient. If its lower than about 5c, I need more than one foam mat. A 3 season sleeping bag does next to nothing to stop heat conducting away from underneath you in a hammock. You need more non compressible or suspended insulation to deal with that
Cold faces can be cured with a balaclava. You'll probably find that the more nights you do in the hammock, the less noticable your cold face will be anyway.
As an example, I bivvied at under -16c this february, the first night out in a month or so at the time and my face felt uncomfortably cold. (my beard was stuck to my sleeping bag with ice)
Fast forward2 weeks to the Arctic where I spent 10 days sleeping out in the snow, it probably got down to nearly that temp on a couple of occasions and wasn't uncomfortable at all because I was then used to it, after steadily dropping temps through the week.
