I've always imagine the song being less literal, more symbolic.
Life without love is like being asleep. You can't feel much of anything. Your eyes are closed. You're almost unconscious. Once you finally experience the feeling of being in love, you're shaken and waken up. You see your life before it as dull, lifeless, and kind of on autopilot. "When does love decide now to shake you and wake you up?"
I've always imagine the song being less literal, more symbolic. Life without love is like being asleep. You can't feel much of anything. Your eyes are closed. You're almost unconscious. Once you finally experience the feeling of being in love, you're shaken and waken up. You see your life before it as dull, lifeless, and kind of on autopilot. "When does love decide now to shake you and wake you up?"