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That, and it's an extra energy expenditure.
It also seems to take more energy to hold my head up the way most other people do, and I'm not an energetic person to begin with. Down at an angle is its natural resting position and has the advantage of blocking out distracting stimuli and keeping bright sunlight out of my eyes(although, cold, dry, sunny winter days are hell because the snow is so bright then and I hate cold and dryness makes me prone to nosebleeds!).
Do people normally and instinctually adopt each others' method of walking just as they do with non-verbal communication?