I think it's too early to ask for a complimentary check-in at that hour.

Say they did provide him with an available room - the next complaint may be that it wasn't upgraded or a suite followed by a compensation request.

Would OP get breakfast benefit that morning as well as the next morning? Would there be another complaint if breakfast benefit that morning wasn't included?

If it's really important to you then book a room the night before or get a day rate.