History Main / NighttimeTransformation

* As mentioned above, some versions of werewolves. For instance, in certain regions of Brazil werewolves are said to transform at midnight on Fridays.

** Lar-On, a Kryptonian werewolf who first appeared in ''World's Finest'' #256 and was also a regular in the ''ComicBook/SupergirlRebirth'' series. Lar-On automatically and unwillingly changed shape at night until he learned how to control his transformation.
** One of the storylines in the first issue of ''Superman's Girlfriend, Lois Lane'' has an offscreen example with a legend about a girl named Molly Todd who became a hag named Mad Molly every night. Lois is [[spoiler: seemingly]] cursed to suffer the same curse after she breaks a mirror in the presence of Molly's picture, providing the impetus for the story. [[spoiler: It then turns out that, actually, she was just turning ''older'' at night because of a failed youth serum. Any supernatural feats were only Superman letting her think she had gained powers until the serum wore off.]]
* In an issue of the German comic series ''ComicBook/GespensterGeschichten'' ''(Ghost Stories)'', an evil scientist tests a longevity potion on some ephemera. When they are still alive the next day, he sees his research confirmed and drinks the potion himself. [[LittleDidIKnow Little did he know]], however, that the mayflies turned into large monsters at night as a ''side effect''. As night falls, he also transforms and is [[ShootTheShaggyDog immediately shot by the police]].

* Much of the initial storyline of the manhwa ''Manhwa/TheBrideOfTheWaterGod'' is moved by the fact that [[spoiler:the eponymous Water God Habaek]] becomes a little boy during the day and only regains his true adult form at night.

* ''ComicBook/{{Superman}}'' comics have Lar-On, a Kryptonian werewolf who first appeared in ''World's Finest'' #256 and was also a regular in the ''ComicBook/SupergirlRebirth'' series. Lar-On automatically and unwillingly changed shape at night until he learned how to control his transformation.

* ''Franchise/{{Superman}}'' comics have Lar-On, a Kryptonian werewolf who first appeared in ''World's Finest'' #256 and was also a regular in the ''ComicBook/SupergirlRebirth'' series. Lar-On automatically and unwillingly changed shape at night until he learned how to control his transformation.

* In ''WesternAnimation/{{Shrek}}'', [[spoiler:Princess Fiona is under a curse where she changes from a human to an ogre when the sun goes down. She's very self-conscious about her appearance, so when Donkey finds out, she makes him promise not to tell Shrek. Near the end of the movie, Shrek finds out about the curse, but since he is an actual ogre, he thinks Fiona is [[BeautifulAllAlong beautiful in her ogre form]]. He marries her, and as a result, Fiona remains an ogre for the rest of her life]].

* {{Inverted}} for the VideoGame/{{Pokemon}} Shaymin, who can transform into its Sky Forme during the day but changes back when night falls.

* In an issue of the German comic series ''ComicBook/GespensterGeschichten'' ''(Ghost Stories)'', an evil scientist tests a longevity potion on some ephemera. When they are still alive the next day, he sees his research confirmed and drinks the potion himself. Little did he know, however, that the mayflies turned into large monsters at night as a ''side effect''. As night falls, he also transforms and is [[ShootTheShaggyDog immediately shot by the police]].

* ''VideoGame/FiveNightsAtFreddysSecurityBreach'': The Daycare Attendant switches forms based on lighting if not actual time, with it taking its Sun form in lit areas and its Moon form in dark areas. Its behavior changes as well: as Sun, it excitedly and overbearingly wants to play and keep its area ordered, but as Moon, its malevolent and wants to punish Gregory for being in the Pizzaplex after hours.

* ''LightNovel/MazeMegaburstSpace'': Maze is a SexShifter who's male at night and female by day, each form having [[MultiGenderedSplitPersonalities a separate personality]]. It triggers even deep underground where there's no way to know where in the day/night cycle they are.

* Creator/NKJemisin's ''Literature/InheritanceTrilogy'': In ''The Hundred Thousand Kingdoms'', the PhysicalGod of [[TheSacredDarkness Darkness]] Nahadoth is enslaved and can only exist in his divine form at night. By day, he's an ordinary human with no memory of his true self.

* In an issue of the German comic series ''ComicBook/GespensterGeschichten'' ''(Ghost Stories)'', an evil scientist tests a longevity potion on some ephemera. When they are still alive the next day, he sees his research confirmed and drinks the potion himself. Little did he know, however, that the mayflies turned into large monsters at night as a "side effect". As night falls, he also transforms and is [[ShootTheShaggyDog immediately shot by the police]].

* In ''WesternAnimation/{{Shrek}}'', Princess Fiona is under a curse where she changes from a human to an ogre when the sun goes down. She's very self-conscious about her appearance, so when Donkey finds out, she makes him promise not to tell Shrek. Near the end of the movie, Shrek finds out about the curse, but since he is an actual ogre, he thinks Fiona is [[BeautifulAllAlong beautiful in her ogre form]]. He marries her, and as a result, Fiona remains an ogre for the rest of her life.

** In a novelle, Agent Skinner meets an old friend he knew from the war in Vietnam. There he was bitten by a wererat and now turns into [[OurWerebeastsAreDifferent such a creature]] every night. He lives in a poor area and kills the homeless every night until Skinner kills him.