Millie is all set for sleep but realizes she’s lost her yawn—something she needs in order to feel sleepy. Accompanied by her teddy, she embarks on a delightful journey across the globe (and even to the moon!), visiting iconic landmarks like the Statue of Liberty, the Mona Lisa, Easter Island, and the South Pole—searching everywhere for her elusive yawn. Eventually, Millie returns home, lies in bed, and as she reflects on her adventures and the friends she made, her yawn returns, and she can finally drift off to dreamland.