Glowing Dogs

It turns out that scientists in South Korea have somehow inserted fluorescent genes into a dog egg, and implanted the eggs into some mix breed dog. What was born was puppies with somehow glowing faces and bellies.

http://www.newsday.com/news/nationworld/world/wire/sns-ap-as-skorea-cloned-dogs,0,4002700.story

Doesn’t this cause some sort of problem for the dogs to sleep properly? I wonder if this is the case, or if the dog isn’t able to detect the light it emits.