I've had dogs that will bark at stuff in the dark that they don't bark at during the day - the shadows are different, things look weird.
Tyr needs a nightlight...When he's crated and I turn the lights out, he'll start crying and fussing. If I leave a light on, he's totally fine. :rofl1: There's a reason they're called melon heads.
For the OP ~ can you do something to change the lighting for him?