Sleeping in a vehicle produces “it’s too bright to sleep”. This is in spite of fact that every single tile is accounted for. All interior tiles have heavy duty roofs, all surroundings tiles have either heavy duty boards or opaque doors or reinforced windshields with curtains.
No floodlights, only headlights pointing away from the vehicle.
Bright currently refers to the time of day more than any ambient artifical light.
Try resleeping. I usually only play insomniacs, and when I get that message Im Super-tired anyway so I can roll back over and sleep. Maybe normies are different, but worst come to worst grab a book and read.