After a particularly hard day at work digging a trench, Bob and the Machines reTyre for the night and a well deserved sleep. The following morning Roley - still asleep - begins to roll out of the yard. Roley 'sleep rolls' towards Spud's field where he nearly runs over Travis. Bird (Roley's ever faithful friend) flies off in search of help. Meanwhile, back at the yard, the team discover that Roley is missing. Bird arrives and tells them that Roley is heading towards Town. Bob, Wendy and the Machines rush off to find him and guide him home. Roley trundles along, leaving a trail of destruction in his wake. Bob and Scoop spot him heading towards the trench they dug the day before. Luckily, Bob manages to build a makeshift bridge across it just in time for Roley to cross safely. Back at the yard Roley wakes up. He just can't understand why everyone looks so Tyred. After all he was the one who was 'working his rollers off' yesterday!