Can you check into a hotel at night, and what are the specific procedures for late-night check-ins"?

Yes, you can check into a hotel at night. Specific procedures for late-night check-ins typically involve contacting the hotel in advance to inform them of your late arrival time, ensuring that the front desk is staffed or has a night check-in process, providing identification and a credit card upon arrival, and possibly completing a registration form. It is recommended to confirm these procedures with the hotel prior to your arrival.