泊まり込み

1. Origins, structure, and basic meaning

• Structure: 泊まり込み, read とまりこみ, denotes staying overnight at a workplace or facility in order to continue working.
• Basic usage: It describes sleeping at an office to meet a deadline or remaining overnight at a facility for emergency readiness.

2. Common pitfalls and similar expressions

• Overnight stay tied to work
  • It is not travel lodging; the overnight stay occurs at a workplace or facility because duties continue there.