you'll be able to set your telephone on airplane manner and set enough time that you want to wake up, and the app will wake you up within the lightest phase of the sleep all around that point with Light tunes.
in the https://www.threads.net/@econopass/post/C6gDW-5v0YL?xmt=AQGzFFKJqs9Yj3vB1PdguagUR1aXO_IZPsgCSim5cJjWpw