Sprouting eyes

[MuddyToes]

I read on SSE that you should place potatoes in a sunny window to get the eyes to sprout. I read on another website (I can't remember where) to keep the potatoes in the dark until the eyes sprout. Which is it? I bought regular grocery store Yukon golds. I realize they may be treated to prevent sprouting but I thought I would give it a try. Potatoes are pretty inexpensive around here.