thank you very much dear LighrkVader. I have also studied biology in university and your information was very interesting to me. please continue...

I have also heard pineal gland in lizards (Squamata) and Rhynchocephalia has major roll in survival as it can be even be used for detecting the location of predators and regulate their body temperature or in reptiles it acts as a calendar. and as a being is more complex in evolution, this gland has decreased in size and function and some assume it as an vestigial organ in human brain unless for dreaming or death (and also some reaction to daytime).

in two times of our life we have a major boost in pineal gland activity. once in the moment of birth and one in the moment of death. it is said those holy visions in near death experience is due to this gland. maybe as a mechanism to decrease the pressure and stress of death. secretion of the gland (knows as DMT) is not really spiritual as its form as drug is doing the same as when we normally induce the gland in our body. meditation has an important effect on secretion of DMT from pineal gland and those holy visions during meditation are related to that. So why its intake as a drug is not holy and it only induces hallucination? maybe both of them are hallucinations. that's why every person in their near death experience would see their holy gurus in their own religion and maybe it is hallucination too. because the truth is only one truth and we can't have multiple gods related to every belief.

so the reality of the spiritual aspect of third eye is really a big question to me and i need more investigations.

by the way...

day 6 : i only practiced 10 minutes and rested so the pain would go.

day 7 : the pain in tailbone was gone. i still saw HI (hypnogagic images) more vivid and faster than before. then i tested if they are random or if they can help me. so i asked some question about my problems and two of the HI were solution to my problems but the others had no meaning. my question were not about super natural and they could be answered by my subconscious. when i become advanced in this practice I would ask complex questions.