I have a corn feeder and a Cuddeback up on my hunting area and the only activity I'm getting is after sundown also. It seems as though they wait at least a day after I fill the feeder until they show up to eat. One pattern that has proven to be consistent so far is that they do show up between 6:30 PM and 7 PM most days. Right now it's getting dark in the woods at about 6 PM here in VA.