Bible scholar N.T. Wright uses the analogy of waking up in the morning for how some people come to Christ through a dramatic, instant conversion and others come to Christ through a gradual conversion:

Waking up offers one of the most basic pictures of what can happen when God takes a hand in someone's life. There are classic alarm-clock stories, Saul of Tarsus on the road to Damascus, blinded by a sudden light, stunned and speechless, discovered that the God he had worshipped had revealed himself in the crucified and risen Jesus of Nazareth. John Wesley found his heart becoming strangely warm and he never looked back. They and a few others are the famous ones, but there are millions more.

And there are many stories, thought they don't hit the headlines in the same way, of the half-awake and half-asleep variety. Some people take months, years, maybe even decades, during which they aren't sure whether they're on the outside of Christian faith looking in, or on the inside looking around to see if it's real.

As with ordinary waking up, there are many people who are somewhere in between. But the point is that there's such a thing as being asleep, and there's such a thing as being awake. And it's important to tell the difference, and to be sure you're awake by the time you have to be up and ready for action, whatever that action may be.