Whenever there's a heatwave a lot of people's main complaint is finding it difficult to sleep and the late Queen Elizabeth had a strict rule that helped keep her royal bedroom cool. She used to enjoy an annual summer break at Balmoral Castle and according to former royal butler Paul Burrell, she "never" closed her bedroom windows when she was there.
Paul previously claimed that the Queen "loved the fact that her bedroom windows were open every night and she would get the fresh air from the highlands". He added that "From August until early October, she never closed" them and when the autumn got "very, very cold" she used a lot of "sheets and blankets and covers and eiderdowns".