Who delivers a package at 22:00?

Seriously...I could think of absolutely NO reason for my doorbell to ring at 10pm. Imagine my surprise to see a delivery man with my package from Amazon.jp. According to their page it was delivered by Nittsu so I guess they deliver at 10pm (really, it was like 10 of, but still). Now, I understand that it might have been important, but it wasn't THAT important. I could have waited until the morning. Not only that, but our doorbell is LOUD and consequently Roo woke up in a screaming terror fit. Took over an hour to get her back to sleep. I need a sign, in Japanese, that says "Please knock, baby sleeping." Yeah...that's the ticket.