I wasn't suggesting they go all the way to the top of a mountain to sleep. To be a bit more specific, *often* they find a small slope or even a fairly flat section of a larger slope and bed down in the cover at the top edge. In other words they can flee left, right, flatter section and downhill. *Often* someplace with a view.

When they go up hill they tend to go on the diagonal and there is often well worn trails.

I read someplace that they tend to find higher spots with fewer biting flies. Don't know for sure, but this does seem reasonable. It may be more likely that they pick a spot to optimize escape routes.

I guess a lot depends on the weather.