I like it dark when I sleep. Currently in the v-berth it is too light. Remember I did try to do something about the roof hatch. So I needed something better. You can get some very fancy Plastimo blackout blinds. But I figured I can do something similar for a lot cheaper. I went to Eason to get an A2 portfolio binder for papers with black plastic covers. I cut the covers into the right size for my hatch and port holes. Then I cut some holes in for some suction cups and voilà:

Cost: < 10€ !

😴