At the end of last night's show we saw Kieran rage at Raphael Korine in particular, as well as Isabelle Warburton, after a pillow fight in the bedroom turned nasty.
Yesterday in the house was the morning after and Kieran was still angry.
He took to the Diary Room to tell Big Brother: "Right, it's just that people stay up until daft o'clock in the morning. They were just bugging me, I just wanted to go to bed.
"Chucking pillows and s**t like that and making loads of noise and p***ing about.
"Fair enough they sit and enjoy the last couple of days we've got in here and like every minute counts but really what are you going to be doing at 3AM in the morning.
"People wanna get to sleep, especially like this, it's so late. I'm knackered."
Kieran added: "If I see people napping from now on, I'm don't know if they may be unconscious so I might have to give them a shake to make sure they are still alive because you never know, better to be safe than sorry."
And Kieran was true to his word, using pots and pans - and his voice - to make sure that none of housemates who kept him awake at night slept during the day.
Later, Raph came to the Diary Room to defend his actions from the night before.
He told Big Brother: "Night time, bed time is like a fun time, you know where you can mess about and have some fun.
"And I felt like he didn't want to have fun and I don't particularly think it was justified."
Big Brother 2017 airs nightly on Channel 5.