'yofukashi' in yofukashi no uta?


So there's this new anime adaptation of a manga called [Call of the Night aka
Yofukashi no Uta](https://en.wikipedia.org/wiki/Call_of_the_Night). In
Wikipedia, the Japanese is given as just よふかしのうた.
[Wiktionary](https://en.wiktionary.org/wiki/%E3%82%88%E3%81%B5%E3%81%8B%E3%81%97)
gives 2 possible meanings

  1. 夜更かし
  2. 夜更し

What's the difference, and more importantly how can they both read as
'Yofukashi no Uta' with that it seems either 1 has an extra 'か' or the other
is missing a 'か' ?




夜更かし is the modern standard spelling, and 夜更し is an abbreviated spelling. The
latter is inappropriate in modern newspaper articles and such, but may have a
literary or traditional flavor. The meaning stays exactly the same.

Many words with okurigana have one or more nonstandard abbreviated spellings.
夜更し is just one of thousands of many similar examples. See:

  * [Why can some words be written with or without okurigana? How do the uses differ?](https://japanese.stackexchange.com/q/6242/5010)
  * [Is there a lingustic term for okurigana omission?](https://japanese.stackexchange.com/q/43055/5010)
  * [How is 向 pronounced in 男性向同人?](https://japanese.stackexchange.com/q/38845/5010)




夜更かし is the modern standard spelling, and 夜更し is an abbreviated spelling. The
latter is inappropriate in modern newspaper articles and such, but may have a
literary or traditional flavor. The meaning stays exactly the same.

Many words with okurigana have one or more nonstandard abbreviated spellings.
夜更し is just one of thousands of many similar examples. See:

  * [Why can some words be written with or without okurigana? How do the uses differ?](https://japanese.stackexchange.com/q/6242/5010)
  * [Is there a lingustic term for okurigana omission?](https://japanese.stackexchange.com/q/43055/5010)
  * [How is 向 pronounced in 男性向同人?](https://japanese.stackexchange.com/q/38845/5010)

