I have 3 silkies that are 4 weeks old. Their in a broader and I removed the heat lamp as the same temperature (72'-77' give or take) in my house which they are indoors. Their fine with the temperature but can they see very well in the dark or should there be a little night light on at a distance so they can somewhat see to go to their food or water? Do they eat at night or sleep the whole night thru? Thankyou!