I would recommend sleeping and affirming that you will wake up and laying still with closed eyes. Or use an alarmclock (with autosnooze) to trigger your own awakening.
Even if I am chocked awake by the alarm, I can still DEILD on that awakening as long as I lay still and have closed eyes. It might not work for you, but it's worth a shot.

This way you can skip the whole relaxation and concentration step and wake up at the end of the WILD stage instead.

Start to visualise on the awakening, then you will soon find that the thought becomes more vivid, then you will feel that the thought becomes a dream.
You are then in sleep paralysis, although not aware of your body, but aware of your dream.