While Queen Elizabeth II is okay with many of Prince William's hobbies, like motorcycles and sailing, there's one that she "stays up at night" worrying about. And truthfully, we don't blame her.

It's reported by Daily Mail that the Queen has repeatedly asked William not to fly helicopters, especially to not pilot them himself in bad weather. It's reported that the Queen has grown more paranoid of a disaster striking, leading to tragic events that would "threaten the line of succession."

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The report said, "It keeps the Queen awake at night, and she is understandably very worried. She knows William is a capable pilot but does not think it is worth the risk for all five of them to carry on flying together and can't imagine what would happen. It would spark a constitutional crisis."

In case you haven't seen, the Cambridges have been arriving and leaving my helicopter a lot more often in recent years. While they typically have a skilled pilot and crew, William has skillfully taken the controls sometimes as well. He was able to get permission after the birth of his firstborn son Prince George in 2013, so the family could spend more quality time together.

Speaking of the line of succession, the next in line is her son Prince Charles after the Queen passes. After Andrew follows William, George, Princess Charlotte, and then their youngest, Prince Louis is the fifth in line for the throne.

Queen Elizabeth II has been a global icon for 70 years. Since ascending to the throne at the age of 25, the long-reigning sovereign has approached her historic role with poise and quiet confidence. But behind the veneer of monarchy, Queen Elizabeth has been the leader of a family and household through good times and bad. Robert Hardman's new biography, Queen of Our Times, takes longtime royal fans behind the veil with unprecedented access to royal records, friends, staff, and more, as the legendary leader and the House of Windsor celebrates her landmark reign. This will surely be known as the definitive book on Queen Elizabeth II.

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