The pop legend admitted he's been breaking into sweats at night thanks to a nightmare where he is performing with the Beatles and the crowd start walking out of the venue.
"I'm with the Beatles and it's going great, then people start leaving," he told UK's The Mirror of his night fright.
"I turn to the others and go, 'Oh God! 'Long Tall Sally' – that'll get them back'."
So what brought on this scary nostalgia, decades after the band's split?
"The first time we ever played – pre-Beatles – I screwed up. So I never played lead guitar again," he said.
"When the Beatles did Wembley for the first time, I felt sick. I thought, 'I've got to give this up'."
Er, thank God he didn't!