A dad joke about getting more sleep than his wife.

So Prince William is off on a royal tour to Namibia, Tanzania and Kenya but this time around, Duchess Kate is staying home. Prince William is President of United For Wildlife and Tusk Trust and this trip will be focused on fighting against the illegal trade of wildlife.

At the port of Dar Es Salaam The Duke of Cambridge, @United4Wildlife President, saw how @UNODC is working to stop the illegal exportation of poached animal products such as ivory and rhino horn #EndWildlifeCrime pic.twitter.com/I2yhpr8XF9

— Kensington Palace (@KensingtonRoyal) September 27, 2018

This is said to be a personal project for William and so this is why he won't be joined by his wife on this trip. However, Kate is said to be 'immensely jealous' of his time away and to be honest, we can't really blame her. His first stop is in Namibia and according to Hello!, last night he attended the British High Commissioner's reception in the capital city of Windhoek. Speaking to guests and making a bit of a dad joke, he said:

"I'm delighted to be visiting Namibia for the first time. "I am only sorry that my wife Catherine is not able to join me. She is immensely jealous, particularly as I am looking forward to a few good uninterrupted nights' sleep this week, away from my wonderful children".

To be fair, we can see how a few nights of blissful sleep would be attractive as life at Kensington Palace is sure to be pretty busy at the moment with three children under five. Kate has been on maternity leave for the summer months after giving birth to her third child, Prince Louis, in April. However, her leave is soon due to finish and on Tuesday, she will visit the Forest School and Wildlife Garden at Paddington Recreation Ground.

The Duchess of Cambridge will visit the @SCTrust Forest School and Wildlife Garden at Paddington Recreation Ground on Tuesday 2nd October. pic.twitter.com/KFdKu7h3C7

— Kensington Palace (@KensingtonRoyal) September 26, 2018

We'll also see the royal couple attend birthday celebrations for Prince Charles next month although the Duke and Duchess of Sussex won't be in attendance, as they will be on an official royal tour of their own.