- SpongeBob SquarePants
- Patrick Star
- Eugene H. Krabs
- Squidward Tentacles (cameo)
- Frank (brief cameo)
- Gary the Snail
- Sir Cecil (debut)
It is a very fine day in Bikini Bottom, and down at the Krusty Krab, SpongeBob adds way too much mustard to the Krabby Patties! Mr. Krabs isn't happy with this, however, he assumes SpongeBob is an insomniac (a person who doesn't sleep). So Mr. Krabs sends SpongeBob home to get more shut-eye.
SpongeBob has a hard time sleeping, so, he goes to Patrick's house. Patrick tries to help SpongeBob asleep by reading a bedtime story. This doesn't work, since it is a "wake-up story" (The Land of Perpetual Excitement). Then Patrick sings SpongeBob his "lullaby", but it is really a wake-up song, since it has the lyrics, "Get up, be active! Get up, be active!" Then Patrick gives SpongeBob coffee, which makes SpongeBob even more awake.
SpongeBob starts running around, and starts hallucinating things, such as a talking glass of milk, a bunch of Squidwards, etc. Then he hallucinates Patrick eating him, thinking he's a spongecake. Inside Patrick, SpongeBob hallucinates Sir Cecil the sleep wizard. Sir Cecil puts sleepy dust (which is really litter from Gary's litter box) on SpongeBob, then he falls asleep. When Spongebob wakes up in Gary's litter box, he snaps back to reality.
Realizing that he's late for work, a very tired SpongeBob goes to Krusty Krab to go sleep in a barrel of mustard. Mr. Krabs takes SpongeBob out of the barrel of ruined mustard, and wonders why SpongeBob couldn't sleep. The sponge confesses that his "insomnia" got the best of him. Then he starts crying tears made of mustard! He cries the perfect amount that is needed to be on the patties. Squidward is happy to see SpongeBob being forced to cry mustard.
- The episode's title is a spoof of the word "insomniac".
- This episode was announced at Comic-Con on August 1, 2011 but didn't air until April 9, 2012.
- This episode was scheduled to air on January 16, 2012, but was pulled.
- This is the fourth time SpongeBob appears in the title card. The first was "What Ever Happened to SpongeBob?", the second was "Oral Report" and the third was "Restraining SpongeBob."
- Error: When SpongeBob ran to Patrick's, Squidward's house is nowhere to be seen. The same error occurred in "The Secret Box".
- The title card scared a few people and younger viewers according to the fans.
- The close-up of SpongeBob's eyes in the title card is used later on in the episode.
- The Mustard Gauge is a parody of a tire's air pressure gauge.
- Squidward makes a cameo appearance.
- Mr. Krabs overreacts to SpongeBob using too much mustard (101% as opposed to 100%), but when he cries mustard, he's using more mustard than before.
- SpongeBob was deprived of sleep before, in Fear of a Krabby Patty. His sleep deprivation once again led to hallucinations.