Celebrities on this years Celebrity Big Brother are being stopped from nodding off by a novel alarm clock.

Each time one of them tries to have a nap, Big Brother sounds a deafening tape of barking dogs.

Donny Tourette was the first housemate to fall foul of the piercing alarm, followed by Jo O’Meara. The housemates are so sick of the sound that Carole warned Danielle not to take a nap in case the barking dogs returned.