According to Osho, when you feel a strong desire to disappear into the cosmos during deep relaxation, it is not suicidal; it is the pull of spiritual liberation—the ego thinning, desirelessness flowering, and bliss inviting total dissolution into existence. Fear labels it 'suicide' and pulls you back. Trust the vertical, inward depth; allow relaxation and awareness to melt the remaining ego thread into living, not dying.
Your small self is relaxing so deeply it wants to merge with everything—not to die, but to feel truly alive—so just watch calmly without fear.