O'Brien, 46, was hit on the head filming a stunt that was scheduled to air that night. Production on the show was halted and NBC ran a repeat Friday.
The comedian released a lighthearted statement acknowledging the incident. "Last thing I remember I was enjoying the play with Mrs. Lincoln, and the next thing I knew I was in bed being served cookies and juice," it reads.
An NBC spokesperson said, "Conan is resting comfortably at home. He is expected to return to work on Monday."