Why does it say "va'Yikatz k'Yashen"?
Radak: He was like a person who fell asleep from drinking much wine, and now he wakens, and shouts and sings.
Why does it say "k'Gibor"?
Radak: He lacked Gevurah only due to the wine. So Hashem was like one who slept due to wine - He saw Yisrael's sins, and was quiet to them, like one who sleeps.
Why did Hashem waken?
Radak: When their sins and evil deeds overpowered, He woke and took vengeance [against the big sinners in Yisrael].
Radak (67), Malbim: He was envious for honor of the Aron.
What is the meaning of "Misronen"?
Rashi: He arouses and invigorates himself to waken from his wine. It is an expression of Rinah (song).