Here's a common pattern for sleeping on a thread you do not expect to be interrupted and both are equally valid and fine ways to implement it:

  try {
     Thread.sleep(1000);
  } catch (InterruptedException e) {
     throw new IllegalStateException(e);
  }

  try {
     Thread.sleep(1000);
  } catch (InterruptedException e) {
     // never happens
  }

In other words, the correct handling is to swallow or throw. The former is likely preferred by those who do assertion-based coding. The latter for people that prefer to discover their bugs in other ways.