So I had my first SP the other day.
I woke up at 5AM and did this cycle:

Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;
Wake up, roll over, look at clock, roll back, fall asleep;

Each time, I woke up 3-7 minutes later, until it was 5:30AM, and SP introduced itself suddenly and unexpectedly, while I was rolling back into position. Yes, while I was moving.

My theory is, that you could be able to confuse your body by falling asleep and waking up a bunch of times in a row.

Source: I'm never going back to sleep - Dream Journals - Lucid Dreaming - Dream Views