The closest I reckon I've ever gotten to this is in a warm to hot bathtub with lavender epsom salts and a good pair of earplugs to keep noise at bay and water out of my ears ... It is relaxing to do deep breathing exercises in this state while repeating mantras to the rhythm of the deep breathing ... I always feel totally relaxed and refreshed after 20 - 30 minutes of doing this ... And, for added effect you can turn out the lights and use candles and/or close your eyes the entire time you're doing it.

Sincerely,
Pfrog!