徹夜明け

1. Origins, structure, and basic meaning

• Structure: 徹夜明け is read as てつやあけ and is a noun for the time or condition immediately after staying up all night.
• Basic usage: A causal condition appears in 徹夜明けで, while a person in that state appears in 徹夜明けの彼.

2. Common pitfalls and similar expressions

• Time and condition
  • It identifies both the period just after an all-nighter and the tired state associated with it.
• Difference from 寝不足
  • 寝不足 is insufficient sleep generally; 徹夜明け specifically follows a night spent awake.