If using my portable setup I am quite particular about it's security. If at a remote observing site by myself or with a small group of people just for a night I will always pack it away in the car before going to bed. If I am at a camp/star party I will leave the mount out to stay aligned but put any optics and other accessories back in the car, and keep a close eye on it as much as practical during the day.
Unfortunately I think no matter the location it warrents some care as to if you'd leave equipment unatended.
If using my portable setup at home (for whatever reason) I would only leave it out while sleeping if it was really required (special early morning event or whatever). Even for the transit of Mercury I still just set it up in the morning, got up 30mins early.
I always leave the observatory locked when I leave it to go inside, even for a short while, I figure I never know if I might happen to stay inside longer than planned.
Roger.
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