whoa, trippy heh, i'd probably chill in bed for abit as well after something like that..

if it happened to me i'd classify it as a false awakening where i was on the verge of waking up. one can feel the SP, or have it integrated into the lucid/FA, as i have experienced a couple times.

the fact that you woke up in the same position you ended the dream suggests that your physical body's condition/position was an influence in your lucid dream.

i've had the rocking sensation too, though not as intense as yours sounds