Fair question - you could have used it, and perhaps have endured a round or two longer, but would have eventually succumbed (ongoing effect, DC increases each round, and also the event is important to the plot).
Then I would have given you back your Odin's Blessing in the spirit of fairness.
I figured it simpler to cut-out the rerolling. Here it is, for completeness:
Round 1
Will DC15 or sleep (Odin's Blessing reroll)
Gunnar (1d20)[5]
DDW (1d20+1)[21]
Freyja (1d20+1)[20]
Skorri (1d20+1)[16]
Signy (1d20+2)[3]
Round 2
Will DC16 or sleep
DDW (1d20+1)[15]
Freyja (1d20+1)[9]
Skorri (1d20+1)[17]
Round 3
Will DC17 or sleep
Skorri (1d20+1)[19]
Round 4
Will DC18 or sleep
Skorri (1d20+1)[9]