Note: this is not a great induction for street hypnosis, but awesome for stage.

1.Make them push their feet together and stand up straight with their shoulders back.
2. Make sure you're in a position to catch them.
3. Use your hand to pull them back gently or drag your finger along their head while your feet are behind theirs.
4. Catch them as they fall.

What you should say:

'Sleep': just as they're about to fall or just as they start falling.
general words of relaxation and deepening during the rest.

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Make sure to practice the mechanics of it first with someone who's with it and can stop themselves from being hurt more.

Again, if you've set them up, this induction is great fun and amazes the crowd. But for pure hypnosis reasons, its not so great.

Have fun!