Jemima Cricket, maybe? But yes, she probably takes it as personal responsibility to try to chill him out when he's wired. Liz on the other hand probably microwaves popcorn, sets up soundtrack music and just enjoys the entertainment.
Word of warning, Liz has probably tried to climb in bed with him a few times. It's not personal, just proximity. Feel free to concoct any number of ways he could have knocked her on her ass, comical, embarrassing or otherwise. She's got next to no shame and Beth would just apologize profusely when she switched back. Oh, and did you want him to know how to swap the two? I think both he and Leah make sense for it.