nah, it ain't no bouncing prison. it's just your brain bouncing. See The Physio-Kundalini Syndrome, page 183 at: https://ia802806.us.archive.org/25/items/Yoga_Nidra_1/ItzhakBentov-StalkingTheWildPendulum_OnTheMechanicsOfConsciousnessV1_text.pdf