In a clinic, nobody closes at six in the evening. The sanatorium, the nursing home, and the emergency room are still operating at three in the morning on a Sunday, and that is where attendance control stops being an administrative procedure and becomes a matter of patient safety. A nursing shift that starts without the person who was supposed to clock in is not just a poorly filled-out spreadsheet: it is a bed without care. Here I tell you how healthcare personnel attendance is managed in Argentina, what the regulations say about the night shift, and why rotating shift planning is the backbone of any healthcare institution.