一泊

1. Origins, structure, and basic meaning

• Structure: 一泊 (いっぱく) combines one 一 and overnight stay 泊 to denote staying for one night.
• Basic usage: It counts a single night at lodging and appears in trip lengths such as 一泊二日.

2. Common pitfalls and similar expressions

• One night can span two calendar days
  • 一泊二日 is a two-day itinerary with one overnight stay, so the night count and day count are not the same.