Mikey decided to take a hard line against the housemates who fall asleep during the day this afternoon.
The Scottish housemate carried a jug of water around with him ready to squirt anyone who dozed.
At one point this afternoon, Big Brother asked the Head of House to make sure that everyone was awake. Mikey was alone in the bedroom at the time and came out to see who was disobeying the rule.
"This is a sorry situation," he told them. "I was caught off-guard. Let's just say people got off lucky."
However, Rex thought it may have been Mikey who was sleeping. "I just saw you nearly asleep on your bed," he said, but Mikey denied it, saying he was "thinking about who to nominate".
Big Brother made the announcement again an hour or so later when Mo fell asleep on the sofa as Mikey was in the garden with most of the housemates. Mikey tried to sneak in and throw water at him but Mo woke up.
"Do not put water on me or I'll throw it back at you," Mo told the Head of House. "I wasn't asleep."
Stu shouted: "Don't talk crap, you were asleep."
Mikey decided to squirt a small amount of water at Mo anyway and tried to confiscate his pillows. An annoyed Mo refused to hand them over and Stu explained to him: "If you fall asleep he'll wet you, so just don't fall asleep."
Rex chipped in: "I think you're taking it a bit too far, Mikey."