"Sleep Singing" is a guided Yoga Nidra psychic sleep and sound session performed by Monika Heidemann, a multidisciplinary artist known for her explorations into minimal pop, synthesizers, and analog drum machines. The performance invites participants into a state of deep relaxation, supported by Heidemann's intimate vocal stylings and live electronic instrumentation. During the Ontopo retreat, the tranquil setting, as seen in the accompanying photographs, created an immersive environment where participants could surrender to the soothing soundscape, bridging the auditory experience with meditative rest.