I'll always love those exceptional peak summer nights if it was a solid clear sunny day before. Once it gets dark-ish around 23:30 and the sky is only a slight navy blue, you can still see a degree of light on the horizon. Then it was fully light by 3 - 3:30AM.
I have a picture from this last summer on my kayak at 10pm and sun setting over the sea. One of my highlights of the year. Kind of my heaven. Then I look out now.. Grim.