"It hasn’t been an easy year for the pair, with all the drama surrounding them, and having to look after a newborn," the insider dished to Us Weekly.
"After the birth, they were absolutely exhausted."
The Duke and Duchess of Sussex are famously going against the wishes of Buckingham Palace and suing the Mail on Sunday for printing personal letters from Meghan to her father, that were shared to the publication by Thomas Markle himself.
The source continues: "There were times they’d bicker over the smallest things because they were so tired. But now that Archie’s sleeping through the night, there’s less strain on the marriage. They can finally enjoy some ‘couple time’ in the evening and feel more rested."
Another source told Us Weekly that as well as Meghan and Harry getting some much needed alone time now that Archie is a little older, their six-month old son is also starting to talk.
"He’s a strong baby and you can tell he’s super smart," the source said. "He can sit up without support and roll over, and he’s almost crawling. He can’t talk yet, but he’s trying!"