Dreamnautes summary:

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'? Indeed, Dreamnauts is your starter shounen with unique artworks and charming concept, a gem that would not disappoint.