The seed potatoes are sprouting too early

 How do you deal with early sprouts?
I have had 3 day of (50f /10c) outside temperature. I was keeping the tubers  in a cool unheated room. Most sunlight was blocked for a few weeks. But with that temp increase outside. Inside temps rose. So the Red Pontiac (Harvested July 08) &  Kennebec (harvested end of Aug), have started to sprout too early.

 I moved them to an area that gets indirect light. I hope to green up the sprouts and stop growth. The Yukon gold (Harvested Aug 08) is the only one not affected. I have been looking for info on Length of dormancy for them,

I will be adding some of the ones with really tall sprouts, to a mixture of cocoa core & organic potting soil. I will try to grow them indoors,for the winter. This is my first attempt to grow potatoes in the house  I may try some in straight core. See what happens.