Not always could I get to low ground by the end of the day.  Sometimes the trail just kept climbing and climbing and day light would disappear underneath the jungle canopy.  It was almost impossible to pedal on into the darkness, nor was it much fun, and most definitely not safe. At the higher altitudes, my constant sweating would turn to an uncomfortable chill. Coming from New Zealand, I was stocked up with clothing to bundle up inside a nylon Viet Nam 'jungle' blanket.  With two sheets of heavy plastic, one for on top and one on the bottom, laying on a mattress of dry leaves, I could make it through those chilly nights.  Maybe not merrily however.