The repetitive, gentle sounds put me into a high efficiency mode without putting me to sleep like most ambient.
[0]: Youtube: https://www.youtube.com/watch?v=2nrgTossoB0
It's precisely via Gamelan, which led me to Akira OST gamelan sounds, that I've discovered Geinoh Yamashirogumi (which then led to Muslimgauze, tangentially)
Cheers!