If you're looking for manga similar to Little Nemo: Adventures in Slumberland Pilot (1984), you might like these titles.
In the city of Salta, a place where the sun never shines, a community of vampires lives. Hipira is a little vampire who lives the life of a typical boy, attending school and dealing with bullies along the way. However, he also has a soft spot for exploring, playing pranks on others and having grand adventures! Whether he’s befriending a human soul, scaring his neighbors by pretending day has come or encountering giant frogs and aliens, Hipira is always getting himself into and out of trouble.
When Noriko, Amane and their friends left for a week-long summer camp experience in the countryside, they had no idea that they were about to embark on a galactic adventure! After helping a wounded, dog-like alien, the creature offers to take them to a spaceport on the moon where fantastical beings, flashy sights and new friends await them. Together, the gang will travel between worlds, dodge nefarious poachers and even encounter the most famous television show in the galaxy, as they embark on the best summer vacation of their lives!
Yuuki Wakasa is a typical 5th-grade school girl who dutifully helps her mother around the house by taking care of her three younger brothers (a.k.a. the monkeys). She often escapes to her room at any given chance to read manga books, which her mother thinks she does too much of! However, when a red magic stone mysteriously falls from the sky, she discovers that she is the "chosen one" who must enter the dream world to save the Sun God that shines in both worlds from destruction.
Sakura Kinomoto never imagined that by opening a book in her father's library, she'd be responsible for releasing wild magic into the world, yet that's exactly what she did. Too powerful to be let loose, the magical Clow Cards were sealed away long ago by their creator, Clow Reed. But all is not lost! For the guardian beast, Keroberos, was sealed along with the cards. Can Sakura, with the help of Keroberos, retrieve the cards before they wreak havoc on the town?
Excessive sleepiness never seems like letting Nattsu, the 14-years old boy has a normal dream. Every time his eyes shut, his world changes into a cloudy dimension with bizarre creatures and strange humans. What is exactly Nattsu's purpose in that world? Why does he keep getting more drowsy? Will someday our MC found out why he was called "Mr. Dreamnotes"?