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—From The 7D Mine Train app
Sleepy is short and has light yellow skin, a pure white beard, black eyes, and an L-shaped peach nose. Sleepy's everyday attire consists of a long blue striped nightcap with a purple line, blue striped pajamas, and gray shoes.
In his prototype appearance, he had less stripes and his hat's point was more sharper.
In "Once in a Purple Moon", Sleepy changes form when the moon turned rainbow. Due to the moon having the color yellow, he changes from his usual sleepy self into a caffeine induced always awake dwarf. The only differences is the visible red bow, his nightgown is unbuttoned to reveal a white blue inner shirt, and his hat is more straight and pointing upwards to equal his always awake persona.
Sleepy is frequently tired and is sometimes seen sleeping with his plush, Mr. Hicklepips. Because of this, he's slightly useless in situations his fellow dwarfs face, but in a few occasions he has managed to save the day. In his spotlight episode, "Sleepytime," a sleeping spell cast by Hildy over Jollywood has no effect on him (he was already sleeping at the time). Sleepy, along with Sir Yipsalot, were the only characters awake in Jollywood. They learn that by sundown the spell will be broken by shouting for everyone to stop snoozing atop Mount Jollymanjaro or they'll sleep forever. A few times Sleepy struggled to concentrate on his journey with Sir Yipsalot, but inspiration from his fellow dwarfs helped him. In the end, everyone woke up and Sleepy along with Sir Yipsalot got awarded for saving the kingdom.
"Gnome Alone" finds Sleepy being accidentally left behind by The 7D when the Glooms tricked them into a vacation to steal the Royal Ruby from their mine. Having overslept, he thinks he's late for work and doesn't realize that the rest of the dwarfs are gone. The Glooms got their hands on the ruby down at the mine and are on their way to Queen Delightful's castle to seize her throne. But Sleepy is able to stop them on his own by snatching Grim's wand along with the Royal Ruby and using the wand to send them away. The Queen then throws a celebration at her castle for Sleepy.
Sleepy loves his Mr. Hicklepips so much that he'll go crazy without him, as shown in "Nicely Done and The 7D" after his plush was seized by the episode's villains.
In "Once in a Purple Moon", Sleepy's usual sleepy demeanor is changed when the rainbow moon appears. Due to it having a shade of yellow, he becomes the complete opposite of his personality.