Yeah, good memories.
I remember a couple of hikes in the middle of the night when camping. I was in Death Valley once and Great Basin, another. Death Valley was below sea level and Silver Cliff campground in Great Basin at about 7200 ft.
Nudewalker is right, it changes the landscape. Mostly everything seems black and white and where I was it was quiet as the grave. Since I was naked I was out well after midnight on both.
Duane