Meghan pulled out of the opening engagement of the day on Sunday Oct. 21 – meeting Invictus Games cyclists – but was present for a reception later on that day.
A source said: “She is not sick, just tired.”
The source revealed that they had expected to return to Admiralty House, where the couple are staying, by 9pm on Saturday night after the opening ceremony.
But because the event was delayed by a thunderstorm, their return was also delayed by nearly two hours.
“We have to try to pace her. We have to make sure she is well paced and not overdoing it,” the source added.
“She had a very late night last night.
“She wants to do everything, but Prince Harry is encouraging her to pace herself.
“We want to make sure she gets enough rest at the beginning of the day and at the end of the day.
“If it has been a very late night due to unforeseen circumstances, we have to adjust for that.”