Well it's not great if the delivery slot was supposed to be during the daytime - and I wouldn't be impressed that my bed had been forgotten about.
But I would be impressed about offering a midnight slot - I actually think lots of people would prefer that to the day anyway, as they wouldn't have to take time off. Can't see it becoming a routine thing alas.
I would be concerned about disruption to the neighbours, and obviously it's not ideal for someone who has to get up to work early though.