Sensory deprivation is for well off adults with leisure time, and I mean that in two ways. The uninteresting way to use a tank is as a spa item:relax and tune out in touch-less isolation for an hour because you have the cash for the luxury. The proper way to use them, though, is in a situation where you can go in over and over again, learning to shift into phase. Achieving anything interesting via sensory deprivation will of course be a subtle endeavor, as, by definition, any little interruption during a session de-deprivates you. Personally speaking, I'm certain that if I owned a tank and had a period free of commitments I could use it to enter states of suspended lucid hynagogia, since I've done this intermittently in bed. The tank just makes those liminal Sunday morning drifts between the realms easier to slide into, to stay in, and relish, at your leisure. Once I got good at it, then I'd take the dissociatives.