Presently we believe that physical forms of energy can't be created or destroyed, only change form. They conform to the best of our knowledge to the rules we've discovered in physics, with the Standard Model, Special & General Relativity as well as Quantum Mechanics being the best science can produce so far in charting what those rules are. Non-physical forms of energy do not appear to obey the same rules, such as travelling through space-time at the maximum speed of approximately 300,000km/sec(there is no speed limit), or being blocked in devices such as a Faraday Cage (EM signals can't get in or out whereas they can).
Currently the best idea we have for the origin of non-physical energies is that consciousness itself has properties that are more fundamental in nature than the physical reality we inhabit. There is much subjective information pointing towards this, such as NDE accounts correctly reporting events after death, and re-incarnation accounts with information being correctly relayed where the information could not be known any other way.
A person's non-physical energy is connected with their moods, thoughts, and feelings, forming an energy signature that changes and updates over time. A person's energy signature remains with them after leaving the physical. For me I don't see this "aura", but I do sense an almost tactile vibration, or an audible hum of varying frequencies that is not otherwise accounted for, alerting me to a presence. Energy sensing can also include other qualities associated with thoughts and feelings from others. It is easier to sense these sometimes subtle changes with a clear and quiet mind, otherwise you can find it difficult to cut through your own mental chatter.
You may naturally become more sensitive the better you get at controlling your mental landscape, and calming your mind.
