Sheldon Cooper (Jim Parsons) will have a hard time keeping up with Howard (Simon Helberg) and Leonard’s (Johnny Galecki) late night work schedules in an upcoming episode of “The Big Bang Theory” Season 10.

In “The Dependence Transcendence,” Sheldon will not be pleased with how serious Howard and Leonard have become in making sure that their invention is flawless when they hand it over to the Air Force. Howard and Leonard stay up very late to work on their invention, and it seems that Sheldon will eventually get fed up with this, according to the show’s spoiler site.

Meanwhile, “The Big Bang Theory” Season 10, episode 3 will also feature Raj (Kunal Nayyar) spending some quality time with Bernadette (Melissa Rauch). The latter, who is pregnant with her and Howard’s first child, is experiencing mood swings. In episode 2, Bernadette got upset over the person who spilled the news of her pregnancy at work. It turned out that Penny (Kaley Cuoco) had been the one to spill the beans.

Following Monday night’s “The Military Miniaturization” episode, Glamour noted how Bernadette is becoming a notable character on primetime television. In one of the scenes, she voiced out her disappointment over how some people would judge her based on her height, looks, as well as the sound of her voice. “I’ve always been treated differently,” she told Amy (Mayim Bialik).

While speaking with Entertainment Weekly, executive producer Steve Molaro said that Bernadette will feel alone in her pregnancy, especially with her husband being busy with his invention. “For the first few episodes, the guys find themselves so caugh off guard in this Air Force project, she’s a little bit on her own with this pregnancy and is in a position to turn to everybody else for support,” he explained.

“The Big Bang Theory” Season 10 airs Mondays at 8 p.m. ET on CBS.