Do you have Dead Butt Syndrome? No joke. Dead Butt Syndrome – also known as gluteal amnesia – is a real condition caused by sitting for too long. Yep, Americans spend so much time sitting that their butts are falling asleep. “Sitting too long can restrict the blood flow, causing gluteal amnesia, which can lead to hip pain, lower backache and problems with your ankles. The glutes will fail to fire properly even when performing exercises targeting the glutes,” said author and trainer Donovan Green.