Rav Zadok alludes to the famous idea that the ram sacrificed by Avraham Avinu at the Akeida had two unequal horns. The smaller horn was blown at Har Sinai, and the larger will be used to usher in the moshiach and the final redemption. Redemption is the message of the shofar permeating completely. The complete redemption comes when the universe is filled with the sound, and personal redemption when I am immersed in it. Now we can go back to the Rambam.
Superficial sleep is what confronts the observer.
Either a person is awake and active or asleep and immobile. All we know is that right now he's not interacting with the world. Profound sleep is that sleep that is experienced by the sleeper, during which the world doesn't intrude. The superficial sleep is represented by the straight shofar, the sleeper awakening to a confrontation with the world. The bent shofar is the metaphor for profound sleep.