Aka is short for Akatosh I take it?
Yes.
And what is Dagon's curse?
He's cursed to be Dagon, the Prince of Destruction. He was the Leaper Demon King, and liked Leaping about. http://imperial-library.info/content/fight-one-eating-birth-dagon.
And Alduin wasn't knocked back asleep, unless you mean in a metaphorical way, a Dragon Break is when he dies and goes through the Dreamsleeve, which took him 1008 years. No?
A dragon break is when time (the dragon) is broken, and becomes non-linear. You can be born before your father, Cyrodiil can become an egg and a galactic empire, and other such oddities. He doesn't "die" and go through the dreamsleeve, AFAIK, the Jills mend him back together and try to fix the timeline. The break the Selectives caused took 1008 years to fix up.
We don't know exactly what the Selectives did, though. They tried to disprove that Akatosh was Auriel, and failed. They then channeled the Aurbis itself to mythically remove the displeasing aspects from Akatosh, when "a staff or tower" appeared and they "danced" on it, "until it writhed and trembled and spoke its protonymic" (http://imperial-library.info/content/where-were-you-when-dragon-broke-complete-version). According to http://imperial-library.info/content/tower, "The Tower is an ideal, which, in our world of myth and magic, means that it is so real that it becomes dangerous." My hypothesis is that the Selectives were trying to remove the Auriel-aspects from Akatosh, when they saw the ideal Akatosh at the same time that Alduin woke up to eat, which, coincidentally, was when Alessia, the first of the dragonborn-emperors, was ruling. After "dancing on" the ideal Akatosh, he spoke his protonymic, and "banished" Alduin. Of course, you don't go about banishing some aspect of time without reprecusions, so.. dragon break. 1,008 years later, the Jills got the Time God back together, but Alduin remained asleep. Until Skyrim.
Granted, though, some of it is a bit of a stretch to fit. I said it was a crazy idea. I just find it interesting how some of it fits together.