Lyric discussion by snarkiness 

Cover art for Sleeping In lyrics by Radio Dept., The

What I see is a friend committed suicide, "He's got no more headaches / Leaving us with empty walls". Sleeping can be a euphemism for death, especially when he's said to be sleeping from morning to night. Also, the perspective this is told from says they don't wonder why, instead they say "what commitment / what grace / to just refuse to be alive"--like how some people talk up (or down) those who have died.