I find when I'm out, I get much better rest that when I'm at home, which I believe is from the fresh air. I don't feel a need for a morning coffee to get kick started. Come to think of it, I can't remember a time when I've been out without coffee, tea or soda when I've really craved for one or had withdrawals.

Only time I bring a thermos is sometimes on a day hunt, and have a cup of hot coffee with a sandwich for lunch, and maybe a sip when I get back to the vehicle; although that's hunting, not hiking.