Technically, checking in at 5:00 AM usually counts as the previous night's stay, as most hotel "business days" reset around 3:00 AM or 6:00 AM. In 2026, if you arrive at 5:00 AM without a prior booking, you will likely be charged for the night that just passed, or you may be told no rooms are ready until the standard 3:00 PM check-in. To guarantee a bed, it is best to book the night before and notify the hotel of your "late arrival" so they don't mark you as a no-show. Some modern "lifestyle" and airport hotels now offer flexible 24-hour check-in or "Day Use" rates, but these must be pre-arranged. If you simply show up, the front desk might allow you to store your luggage and use the lobby facilities until a room becomes available.