Dreams and Bardos

Ken Wilber, following the buddhist teachings and the advaita vedanta tradition, says that there's a surprising relation between the 3 states (waking, dreaming and deep sleep) and the 3 after-death bardos. Here he talks about the subtle state (sambhogakaya):

"This is why, for example, if, during one's lifetime, one practices meditation and learns to enter the dream state with awareness (lucid dreaming), it is said that one can then control to some degree one's actual bardo course of rebirth, because to master one is to master the other: they are essentially the same realms."
—KEN WILBER