forgive me if this is a ridiculous question, but i'm new to hammocking and need some clarity. i'd like to hang without my tarp on nights that i know it won't rain, and i know many of you do this. do i need to worry about dew or condensation collecting on my hammock? i'm not a meteorologist or anything, so i'm not sure under which conditions this becomes possible, but i know i've seen moisture on my fly when sleeping in a tent. i'm assuming it has something to do with the temps at night and the dew point (whatever that is). is there some rule of thumb i can go by?