I Won't Let You Sleep Tonight
Sample Screenshot | Title Card
Japanese Title 今夜は寝かせません
Konya wa nekasemasen
Episode 12
Airdate April 10, 2011
Manga Chapters N/A
Previous Episode Episode 11
There Were Things Money Can't Buy
Next Episode Episode 13
Baby Beel: The Assessment Test (Part A)
Hilda: Dear Great Demon Lord (Part B)
Theme Music
Opening Hajimaru no wa, Sayonara
Ending Tsuyogari

I Won't Let You Sleep Tonight (今夜は寝かせません, Konya wa nekasemasen) is episode 12 of the Beelzebub anime.

Following the 2011 Tōhoku earthquake and tsunami, the pre-opening sequence for this episode had been modified to remove scenes suggesting the disaster.


Beelzebub has been crying all night for the past three nights, which is causing Oga and the whole neighbourhood to get very little sleep. Wanting to stop his night crying to avoid being chased out of their house, the Oga family attempt to play with Beelzebub all day in order to tire him out come nighttime. Despite managing to get him to sleep, Beelzebub still wakes up and cries in the middle of the night. After Oga spends the day dealing with a sleep deprived Tōhōshinki, Hilda brings a toy that calms Beelzebub down, but is even noisier than his crying.

Next episode previewEdit

This next episode preview was produced and aired prior to the 2011 Tōhoku earthquake and tsunami, as the next episode was originally to succeed episode 9 before being postponed because of the provocative nature of the overall series.

Hilda introduces what's happening next week in the series. Oga's Father introduces himself, feeling nervous as it is his first preview. He comments on how he doesn't really have a name even while Furuichi's sister, Honoka, does. He then remembers to introduce the next episode. Hilda tells the viewers to watch the next episode and bids farewell to the viewers. Oga suddenly yells at them quickly to stop.

Characters in order of appearanceEdit

  1. Tatsumi Oga
  2. Beelzebub IV
  3. Misaki Oga
  4. Hilda
  5. Oga's Father
  6. Great Demon Lord (flashback)
  7. Oga's Mother
  8. Takayuki Furuichi
  9. Ishiyama High Principal
  10. Hajime Kanzaki
  11. Takeshi Shiroyama
  12. Chiaki Tanimura
  13. Aoi Kunieda
  14. Nene Ōmori
  15. Kōta Kunieda (dream)
  16. Tatsuya Himekawa
  17. Hidetora Tōjō (dream)
  18. Acid Suzuki
  19. Alaindelon


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