hehe, you call that night? To each their own!
To me, morning isn't a matter of any set sort of sounds, but a feeling, a mood of the morning. It doesn't have to be slow, either! Sometimes its nice to have some crazier stuff for the morning rather than the usual morning full on or nice smooth progressive. Just because its the way its always been done, doesn't mean there aren't other ways of doing it! I think of vibrant, full, colorful music when I think of the morning, and most of these tracks fit that description.
I love morning fullon and smooth prog as well, but sometimes I just want something harder and crazier...
And, parties here in the US, at least the ones I like to go to, usually play much harder and faster stuff in the night time. Compare Guinea Pigs and Zolod to, say, Jellyheadz, or Orestis, and you'll see, they are quite different.