I did further research in how something like the Dreaming Buddha could be triggered more accurately. I looked how in scientific fields sleep and dream is analysed. With the help of EEG and EOG it would be way easier to trigger events as playing sound or soft vibrations on your arm in the right sleep phase.
I compiled some experiments but didn’t try them out myself as in my opinion this is a very scientific approach to dreams and rather tries to explain how our brain works. Also there are (or have been) already a few products that go exactly into this direction.
Feel free to conduct your own experiments with those two methods.
1. EOG/EEG Wearable or through open-API Wearables (Fitbit, Jawbone). Find both method sheets here: EOG-EEG-API-to-trigger-events.