Deathbed conversion?

I have just been listening to a sermon preached by Rev'd Richard Bewes. In it he speaks of those who think they can always become Christians later on in life, perhaps even on their deathbeds. He said that as a clergyman he has seen hundreds of people on their deathbed. Richard Bewes said it is likley that when you and I are on our deathbeds we will be so pumped full of drugs that we wont be in any position to decide what we want for lunch, let alone where we should spend eternity.