A New York Public Library Best Book of 2025 César must solve a bedtime mystery in this fun, child-centric story about family life with a working single mother. There's a big mystery in little César's life. Every night he falls asleep in his own bed but every morning he wakes up at his aunt's house. Could he be sleepwalking? Is his bed a magic portal? What if aliens are involved?! One night, César tries his very hardest to stay awake. Will he finally discover why he sleeps here and wakes there?