The 38-year-old actor and wife Blake Lively welcomed their first child at the end of last year, reported E! Online.
During his interview with host Jimmy Fallon, Reynolds joked: "Our baby in particular is, we think, allergic to sleep... We think that she thinks she's protecting us from the sleep monsters. Like, 'Oh, I've got to keep them up or the sleep monsters will get them'. God."
Sharing his secret for getting her to sleep, he said: "The trick I try to use is that Baby Einstein stuff, but for me, that's like horse tranquilliser. I could go down on a lit stove. You could push me out of an air plane, and I, yeah, and the weirdest dreams."
He also described fatherhood as "the best" adding: "I am a slave to the rhythm... I can't wait. It's just going to be teatime every day with her.