when i travel for work i turn into a bit of a zombie. i don't sleep enough, i eat odd amounts at odd times, and don't feel productive. i either try to squeeze in some activity that exacerbates those things or i go from work to hotel to work to airport and a week has disappeared with nothing much to show for it.
tangentially, it only took me ten years to realize that headphones are your friend, but at least it wasn't eleven.
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