Sara, Conor McIntyre and Luke Scrase have been locked in the White Room and are battling it out for a free pass to the final. The housemate who lasts the longest in the White Room will win the prize.
While in the room, the housemates must wear all white and drink and eat white food. Big Brother also keeps bright white lights on throughout the day.
Luke S has compared the room to a "mental institute".
"What time is it? I can't stay in here much longer," said Sara.
"It's driving me insane, I can't stay in here tonight."
The White Room housemates will take part in challenges with the other housemates during the week as part of a shopping task.
Big Brother continues daily on Channel 5.
[Big Brother Day 56 - Photo Gallery]
Copyright: Channel 5