Season 10, Episode 20 - The Recollection Dissipation
Aired April 6, 2017
When Sheldon double books himself and must work on projects with the guys and with Amy on the same day, he wears himself down and catches the flu. After Sheldon takes cold medicine to power through the illness, he loses track of an entire day ... and a notebook containing classified information.
Meanwhile, Bernadette has mixed feelings as her maternity leave comes to an end, while Howard worries that he did something to anger Bernadette.