The world 's fastest man arrived at Jamaica 's training camp at the University of Birmingham this week .
Before he laid his head , the sprinter 's coach , Glen Mills , asked for his bed to be replaced by a bespoke 7ft mattress .
The world 's fastest man arrived at Jamaica 's training camp at the University of Birmingham this week , but before he laid his head , the sprinter 's coach , Glen Mills , asked for his bed to be replaced by a bespoke 7ft mattress .