徹てつ夜や明あけ

noun which may take the genitive case particle 'no', noun

after an all-nighter; morning after staying up all night

Describes the state or time after having stayed awake all night, often implying tiredness or a groggy feeling. Commonly used as a noun or with の to modify another noun.

• 徹てつ夜や明あけで頭あたまがぼんやりしている。

  My head is fuzzy after staying up all night.

• 徹てつ夜や明あけの試し験けんはきつい。

  An exam after an all-nighter is tough.