From Fergal at the official page:

“Hi , it’s me again.
We are in Minneapolis, and badly hung over I’m afraid!! We played in Chicago last night and it was a great gig so everyone was in flying form. As today is Dolores’ birthday we threw a surprise party after the show which continued onto the bus. We have about twenty or so people working with us on the tour and they are all really nice so it’s always good to have a night like that to help everyone relax after working so hard for the past few weeks.
I’m afraid I have to go back to bed now for a snooze so I’ll talk to you again in a few days.
Take care,
Fergal.”

Looks like the band partied a little TOO much! 😀

Source: The Cranberries Official Homepage (www.cranberries.ie)