According to Osho, mountain caves aid samadhi only for a well-prepared yogi: through deep pranayama the body is richly oxygenated, so reduced air and isolation don’t induce sleep but sustain alertness. The cave’s protective silence and specific stones and shapes shield harmful vibrations while attracting supportive ones, creating an energetically undisturbed field where awareness can intensify and unify with the absolute; otherwise, cave practice decays into unconsciousness.
A cave helps only if you’ve trained deep breathing first; then its quiet, protective walls keep out bad vibes so you stay awake and focused instead of just falling asleep.