One night, the Nohara family were enjoying a pleasant dream, when suddenly a big fish appeared in their dreams and ate them. The next morning, Hiroshi read in the newspaper that everybody in another town had the same nightmare as him, but it seemed to have ended. But Hiroshi also heard the same dream from Misae, Shinnosuke, Himawari and even Shiro. They were surprised and thought if the same thing is happening in Kasukabe too. In kindergarten, on telling others about his nightmare, Shinnosuke was surprised to know that everybody too had the same dream. Then a mysterious girl named Saki was transferred to Futaba Kindergarten and joined Shinnosuke's class. Everyone in the class, including the rather inactive Bo-chan, were all excited and happy on seeing her. But Saki had a cold attitude and didn't get along well.
Unfortunately the movie Crayon Shin-chan: Fast Asleep! Dreaming World Big Assault! is not yet available on HBO Max.
| Directing | Wataru Takahashi | Director |
| Sound | Toshiyuki Arakawa | Original Music Composer |
| Sound | Shinji Miyazaki | Original Music Composer |
| Sound | Kyary Pamyu Pamyu | Theme Song Performance |
| Visual Effects | Masayuki Yoshida | Key Animation |
| Visual Effects | Tatsuya Oka | Key Animation |
| Sound | Akira Ookuma | Sound Director |
| Writing | Michio Mihara | Storyboard |
| Writing | Yasutaka Nakata | Lyricist |
| Visual Effects | Katsunori Hara | Animation Director |
| Visual Effects | Yuichiro Sueyoshi | Animation Director |
| Visual Effects | Shizuka Hayashi | Key Animation |
| Art | Michio Mihara | Art Direction |
| Writing | Wataru Takahashi | Writer |
| Writing | Yoshito Usui | Original Story |
| Writing | Gekidan Hitori | Writer |
| Visual Effects | Hirofumi Masuda | Key Animation |
| Visual Effects | Michio Mihara | Key Animation |
| Visual Effects | Hiroshi Shimizu | Key Animation |
