The 'Common People' singer, who returned to the Sheffield indie group in November last year, revealed that he has had nightmares ahead of the band's performance at this weekend's Primavera Festival in Spain.
Speaking on BBC 6Music, he said: "I've had a few anxiety dreams already. The favourite is usually wandering through a festival, then looking at your watch and realising you should have been on stage ten minutes ago. I've not had the one of being naked on stage yet".
Meanwhile, guitarist Mark Webber revealed that the decision to reunite came after the death of a mutual friend.
"I always thought we'd do something together again eventually, but when he died, I realised [we] should maybe grasp that opportunity," Webber divulged.
Frontman Cocker added: "I think that [the death] had a lot to do with it. You suddenly realise you can't take things for granted."
Watch Pulp perform 'Disco 2000' at a Primavera warm-up show in France below (video contains strong language):