Opinions - Black out, Lucid dream or hallucination?

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Ok... Swim has had a good homecoming weekend at his college. Been drinking 4 days in a row, but the last two nights have been crazy. Swim basically dreams that he is partying. He was dreaming a bout being at a party and can remember pretty much everything about this. He feels like he's hallucinating but he's definetely sleeping, or passed out. For instance, Swim was at a make belive party that he believed was real, he had no memory that he already went out and came back to pass out. Then his friends just started showing up and a party was there. This is weird and interesting at the same time for him.

So what would cause this? Swim smoked weed 2 nights ago that might have helped, and swim rolled during the day before he went out and got his drink on. He drank about 10 to 12 beers all 4 nights he estimates. Any ideas what's happening?