The comic double act was finally exorcised from Williams's sleep after Little got in touch to ask for a favour.
The 65-year-old told Lancashire station 106.5 Central Radio he had contacted the singer to ask if he would sign a CD for an ill fan.
"I couldn't believe it when Robbie rang me [back]. I just thought it was Bobby Davro winding me up doing an impression," Little said, adding that he eventually realised it was a genuine call.
"Robbie then went on to say that he had recurring dreams, almost nightmares, which involved Little and Large but, now that he'd spoken to me, the dream had been broken."