Separating consciousness from physical body for ~24 hours (or dying and coming back) has been one of key exercises of Tibetan lamas and some yogis for thousands of years - in advanced stages of their training.
I heard of at least one modern scientist (physicist) who become convinced that it is possible and actually tried this exercise to explore structure of atoms. See this topic for more details.
~2000 years ago a man demonstrated immortality of consciousness in public - coming back to life on the 3rd day after being hung on a cross and murdered.
There is a looong string of medical cases where people came from "dead" many hours after clinical death telling stories where they have been when "out" and what did they see.
It is one of the greatest failures of humanity on Earth that these traditions and witness reports are not receiving the attention that they deserve. Interfering with ancient Tibetan traditions and culture is a crima against entire humanity.
Please read The Freedom of Choice book again, several times if necessary, and try not to miss an argument that Your Consciousness is the only thing in the entire Universe that is actually yours.
Your physical body and every atom in it is actually temporary.
Whether or not you will be able to sustain and continue your existence in the Universe depends solely on how you program your own Consciousness. If you program it with clutter, fear, monetary and material attachments, misinformation and deceit - you are likely to get lost and perish.
It is not a coincidence that a wise man ~2000 years ago said "Whoever finds the inerpretation of these sayings will not taste death" (the opening statement from he Gospel of Thomas). This man not only had demostrated immortality of consciousness, but also insisted that everyone can do what he did.
Aren't people on Earth missing the point of being alive?