A work message arrives after dinner. There is no deadline, no demand for an immediate response. The notification preview reveals enough to understand what it is about. The phone goes back on the table. A minute later, the sender’s name is checked again.

An app is opened twice in five minutes, even though nothing new has appeared. The phone is picked up not because anything requires attention, but simply because it is there.

A deadline, oddly enough, can make things easier. “I need this before 9 tomorrow” is clear enough. What is more irritating is the document forwarded with a question, or an old email thread that suddenly comes back to life after dinner. Someone replies with a simple “Thanks,” and suddenly the whole group is copied in. Someone else responds. Then nothing happens for twelve minutes.

At work, people tend to figure out fairly quickly who answers at night and who does not. Three replies within 10 minutes can tell a new employee more about the culture of a workplace than any formal policy ever could.

The message has been seen. Sometimes a reply is typed, reconsidered, and deleted because answering might simply invite the next question.