Like all (un)professional ladies-in-waiting, who would have been one of the late royal's most trusted confidantes, Jane Parsons will auction off some of the private letters Diana wrote to her and the royal households.

About 25 letters will go under the hammer and span the early years of her marriage, the birth of Prince William and her 21st birthday.

However one note, dated August 15, 1981, has raised the eyebrows of many royal watchers.

Diana wrote to Parsons while on board the Royal Yacht Britannia where she was celebrating her honeymoon.

"The honeymoon was a perfect opportunity to catch up on sleep," she wrote on the palace's crested paper.

While some pundits are claiming this is the icing on the cake proving the relationship was doomed from the start, it's important to remember she was just 20-years-old and the star attraction of the "wedding of the century" to the heir to the British throne. Not to mention they'd only been officially dating for about six months.

The royal wedding saw an unprecedented amount of attention thrust upon the stuffy House of Windsor and the "common" kindergarten teacher's aide Lady Diana Spencer was at the centre of the media storm.

The "fairytale wedding" was televised and watched by an estimated 750 million on television alone. That's a lot of pressure, more pressure than just finding the right bunting and creating a snappy hashtag.

She also wore an ivory silk taffeta, antique lace wedding dress and train that was almost 8-metres long. Lugging that around for hours would have been fashion equivalent of a Kayla Itsines workout.

Once the couple returned from their short break they held a press conference where Diana described the honeymoon as "fabulous" and said she could "highly recommend marriage. It's a marvellous life." Well said Di. Sleeping is fabulous and a lot of us don't get enough of it.

Alas, after the lazy honeymoon and wedding at St Paul's Cathedral in July 1981, the couple separated 11 years later in 1992 and divorced in 1996.

According to her letters she continued to be tired after sleep-stealer Prince William was born.

Following his birth she wrote to the household staff hoping they were not left "exhausted, overworked and underpaid".

"I know you are being buried under a avalanche of mail...don't despair, there won't be another baby Wales until I've had a decent rest," she wrote.

In his letter Prince Charles was "apologetic at all the extra work we are probably going to land on you!"

The palace received 4500 baby presents in the days following William's arrival.

Official records show Parsons and other ladies-in-waiting then sent our 24,000 thank you letters.