This is when you are asleep, and your frontal brain lobe makes you aware that you are sleeping and dreaming. I’ve seldom had this experience, but it has happened, and I remembered it. Like dreams themselves, it’s interesting. Also, like dreams, you can spend thousands of US dollars on learning and doing more about it. But, even with personal experience, I must weigh in with a bit of not so fast. The whole dream business is packed with frauds, charlatans, and quacks, and the awareness aspect has been roped in at great profit.
If you need help with lucid dreaming (I cannot do it intentionally) you can purchase books, tapes/CDs or whatever the tech is today, scientific publications, and induction devices such as special lights and speakers. You can spend money and time going to seminars to help you tap into your unconscious mind and get continuing education or college credit (Psyc.).
Perhaps you will fly (in your dreams) with spirits and have an out-of-body experience you enjoy, and that makes you free (again, you’re dreaming) of the restraints of being human and gravity bound to Earth. Maybe you will even feel better. But I doubt it.
There is no special state achievable by paying a fee through which we can find transcendent consciousness any more than we can stop having nightmares because we don’t like them. But, as with so many things, you can pay the price and take your chances. You can also read a lot more about it, if you are so inclined.
I prefer to know when it happens and what the biological cause is. When I wake from my off-base dreams, many of which relate to my life 30 or 40 years in the past, I know immediately that I was dreaming and what facts were twisted in my dreams to create the imaginary scenario.
So, yes, it is a real thing. But I doubt that it is what many seem to think. From reality to woo-woo, and to $$ all the way to the bank once again.