From what I can tell, nighttime doesn't really play any important role in the game unless a mission forces it. I'd love to play always in daytime - is it possible to skip or disable night in Horizon?
No, there is no way to fix or manually change the day/night cycle. Many people have commented on that in various threads, such as this one:
There doesn't seem to be a rest option that we are used to. The only thing I've noticed is when I hit a Campfire to save. There is a bit of a cut off during the manual save as well as if you incurred any damage it seems to replenish lost health. Spoiler. Other than that no I haven't come across any way to actually rest/fast forward the time cycle.
As well as this thread:
Don't think you can. I haven't come across any daytime restricted activities tho so it doesn't matter.
For what it's worth, during the 50-60 hours I played, I was also unable to find any way to manually alter the day/night cycle.