Two things that make this work more efficient are the quality of sleep that we get as well as the position that we sleep.
They found that side sleeping was activated this area more so than sleeping on our stomach or our back. And that left side was even better than the right side.
So, homework is to start side sleeping and to remember that sleeping is habitual and that doing this WILL take some time to get used to.
Let me know if you have any questions!