Widmore's Nightmares

In Season Four's "The Shape of Things to Come", Widmore tells Ben he hasn't slept well since the nightmares started. Does anyone have any ideas what his nightmares could be. Does someone else possess special abilities like Desmond and can change the past and is Widmore experiencing new memories? Maybe Widmore has some sort of special powers and it experiencing "temporal displacement"? I think this is pretty important to Widmore's backstory and I hope someone else has some possible theories of what could cause these nightmares...or I am just over-analyzing something again!