Lyric discussion by sbryant31 

Cover art for Using lyrics by Sorority Noise

This guy is in recovery, and he's not doing well. So he relapsed.

This song is both about the positive aspects of relapse and the negative aspects.

When you're drugged, you can sleep. When you're drugged, the endorphins can bring you back to your happy place.

He started using again, which creates a rush of nostalgic feels. He's back to himself.

Of course it' fleeting. But this is the positive aspect of relapse. The euphoria before the collapse.