Doomsdag

Doomsday: The Last Judgement. In Christian eschatology, the Last Judgment or Judgement Day is the ethical-judicial trial, judgment, and punishment/reward of individual humans (assignment to heaven or to hell) by a divine tribunal at the end of time, following the destruction of humans' present earthly existence. http://en.wikipedia.org/wiki/Last_Judgement

Therefore the asleep (dead) HCE is holding judgement on himself (dreaming).

Dag (Dutch): Day

Dagr ("day", modern Scandinavian: Dag, modern Icelandic: Dagur) was, in Norse mythology, the god of the daytime, a son of Delling (god of twilight), and is the brother of Nótt (goddess of night). Dagr, the Bright and the Fair, drove across the sky in a chariot every day, pulled by a horse named Skinfaxi. Skinfaxi's mane lights up the earth and sky. Nott's equivalent horse, Hrimfaxi, lights up the night. The d-rune ᛞ is called Daeg "day" in the Anglo-Saxon rune poem. The rune is also part of the Older Futhark, with a reconstructed Proto-Germanic name dagaz. The corresponding letter of the Gothic alphabet 𐌳 d is called dags. http://en.wikipedia.org/wiki/Dagr