The singer has died, and is realizing it and realizing what he wants of his lover, in that very last second of life.
"Stay until you're sure that I'm asleep" - Don't leave me yet, don't go until I'm gone.
"Just wait until tomorrow, bury me in sorrow, cover me in joy" - I'm gone. You'll get past this and in the meantime, be sad if you must, but remember me with joy, becauser that's how I'll remember you.
"Every afternoon I wasted being mad at you, the things I never said, the things I can't say tomorrow" - All of that shit isn't important, I said things and you said things and the rest will never come, so don't dwell.
"I'll have an eternity to think about tomorrow" - I'm not going anywhere. I just might never think of anything but you again, and how you're getting on, and what happened once I was gone?
The singer has died, and is realizing it and realizing what he wants of his lover, in that very last second of life.
"Stay until you're sure that I'm asleep" - Don't leave me yet, don't go until I'm gone.
"Just wait until tomorrow, bury me in sorrow, cover me in joy" - I'm gone. You'll get past this and in the meantime, be sad if you must, but remember me with joy, becauser that's how I'll remember you.
"Every afternoon I wasted being mad at you, the things I never said, the things I can't say tomorrow" - All of that shit isn't important, I said things and you said things and the rest will never come, so don't dwell.
"I'll have an eternity to think about tomorrow" - I'm not going anywhere. I just might never think of anything but you again, and how you're getting on, and what happened once I was gone?
That's my take on it, folks.