When the M92 will run on android then we may come back to this idea. I have got a feeling though, that it won't happen very soon.
But after some more thinking I have realized that the same result can be achieved with a much simpler approach which doesn't need any new software or modification. Simply create silent MP3 files of specific durations like 1hour, 10 minutes, 1 minute etc. and use them on the playlist as spacers between the real suggestive files. This way the text can be played back approximately during the REM phase of sleep only, for better efficiency. Leaving the rest of sleep time silent for deep sleep and refreshment.
The method should be tested for efficiency and usefulness first with this simple approach. If it proves to be worthy, then we can put more effort into refining the playback application.