Physical Dangers Of Prolonged Ap? Options

I read an account in a book about a boy who astrally projected, in an outdoor scene. He stayed in for about 6 real hours, and when he had regained conciousness he had found out that his physical body had done things while he was gone! But even after that he was in a lot of pain, and heard a voice in his head warning him that AP can lead to physical breakdown.

Anyone heard an account similar to this?

In a deep state of mind that is similar to sleep the body has a natural machanism that keeps it from acting out what it dreams, or experiences. However through the complex processes of sleep and deep meditations the body does sometimes by pass this defense machanism. This can lead to a wide range of events such as sleep wlaking or talking or in extreme cases even murder.

The possible dangers of AP or there regardless of the time period one is working in. Though I have read that beginners should work up to spending long periods of time rather than going from a few minutes to several hours over night. The danger is in that when the astral body is away from the physical the concsiouness is essentially fragmented. Sorta like removing a piece of a puzzle. Typically the mind fits right back into its body with no problems. But sometimes the mind is disturbed from its trance state and forced back in the body more abruptly than it can handle. This can lead to astral bleeding where the body continues to leak out energy even though it is not in an astral state. This can be corrected through simple grounding techniques. Another hazzard to though who AP are astral "nasties". Basically the astral world is a plain of existance on to its own with things/ entities that live there. Some are predatorial. Astral beings can make for strange bed fellows. It is not wise to listen to beings one may encounter, even if they appear friendly. They may try to sap one of their energy or get them to do or believe in things that can be harmful. Other kinds of entites are parasites and they can attach themselves onto one's astrall body and sap one of their energy. Another thing to consider is the reason why one practices AP in the first place. As with many other things there are healthy reasons and unhealthy reasons to practice AP. It is not wise to over indulge in AP simply because it can feed into one's delusions or compulsive behavior. It is possible that AP can lead to psychosis in extreme cases. But because actual astral projection is so widely dis-missed by mainstream science we know little about it.