Baby's rooms are unlike any other in the house. They are supposed to be stimulating for the senses yet serene for naps. Cheery and playful during the day, but dark and motionless at night.
Lighting can sometimes become a challenge for nurseries. A quick and relatively painless fix is to install dimmers in the room. Dimmed lights are just what baby needs to wake up to in the morning and fall asleep at night. And during the day, he can romp around in all the glory of a full beaming overhead bulb. It also makes it easier on you for those feedings before dawn.
If you don't know how to do it yourself, an electrician should be able to install them.