The technology is there for sure. The only question is whether there's a market for toddlers that have their own night-light imprinted into their own DNA.

Hopefully

If scientists could figure out a type of chemical that could be induced into the heart (that the heart could continualy reproduce), than the blood that flows through your body could induce a glowing side-affect. Say we used glow-stick liquids, scientists could inject it into people's veins to make people glow.

This would make sleeping VERY hard tho