The only reall meaning I found to the sea of Lucero is a song, call Gone to the Sea, from Lucero, who claimed that his heart had been landlocked and gone to the sea.
Maybe it could be other sea, but it makes sense.
About the prisoner part, i think you are right.. it's prisoner.
And by the way, I have completed the Chinese Sleep Chant lyrics.. what do you say?
Fall asleep
Driving me
Sleep satisfied
Sleep satisfied
Fall asleep
Driving me
Sleep satisfied
Sleep satisfied
Sleep
Sleep
Sleep
Sleep
Sleep satisfied
Sleep satisfied
Fall asleep
Fall asleep
Sleep crucify
Sleep crucify
Fall asleep
Fall asleep
Sleep satisfied
Sleep satisfied
Sleep
Sleep
Sleep
Sleep
Sleep satisfied
Sleep satisfied