Lyric discussion by DuskofCivilization 

Cover art for Wreath lyrics by Opeth

I think that this song is about someone who kind of goes insane at night. "Falling inside again This nightmare always the same" this could be when he is going to sleep. "Endless night" also supports the sleeping idea."Halting at the brink of discovery Moving into the darkness Leaking inside to cover up" He might be trying to recall some sort of horrible event in his past, this part also seems to point at this: "Old memories I'm not in need but wish to know What are the tragedies The history behind the walls Pacing further down" "Closure to bleak matters - I'm leaving End of a search Coming of morning - Returning" this is when he wakes up from this 'nightmare'