Hader said, grinning and trailing off. As he tried to recall the first time he did a Dateline sketch at SNL, he could barely even look at Morrison. "I'm so nervous right now," Hader admitted.

When it comes to his time on SNL, Bill Hader has never been private about how mentally taxing being on the show was and how it had a physical effect on him. Appearing on Late Night With Seth Meyers ...