The writings of Satguru Sivaya Subramuniyaswami who was the 162nd head of the Nandinatha Sampradaya's Kailasa Parampara and was the Guru at Kauai's Hindu Monastery are quite revealing. He lived in the Ashram system of Hinduism and was initiated and trained under advanced Kundalini Guru's in the Shiva tradition:
In 1947 at the age of 20, he journeyed to India and Sri Lanka and in 1949 was initiated into sannyasa by the renowned siddha yogi and worshiper of Lord Shiva, Jnanaguru Yogaswami of Jaffna, Sri Lanka who was regarded as one of the 20th century's remarkable mystics.
Satguru Sivaya Subramuniyaswami stated in his writings that it took him 20 years of intense and demanding daily and nightly practice that pushed him to the limit to awaken the Kundalini power and this was done under the guidance of advanced Guru's. He also stated how dangerous this is and how its common for people to develop what seems to be medical conditions but are not its the astral body the prana in the organs being cleaned out and hitting major blockages this can leave people laying in bed for weeks. This also involves depression and other states of mind. People go through intense issues and have to strain themselves for years to even awaken the Kundalini. The texts also warn of madness if this is done wrong. Other Kundalini Guru's who trained and were initiated in the east also state years of intense effects on their physical and mental state. If one understands what is being described of there experiences its simple. The energy is hitting major blockages in the soul. If this is happening to a initiated Sannyasa in an Ashram then what can the average person expect. We are very lucky to have our Gods helping us. This includes the Final RTR which removes the blockages the bindings of the enemy.
Satguru Sivaya Subramuniyaswami mentions the crown chakra has a major seal on it and it takes a lot of years and intense practice to open this up properly. The crown chakra in the ancient eastern and Native traditions of the Hopi as well is stated to be the seat of the higher psychic abilities. Satguru Sivaya Subramuniyaswami also mentions all the chakras have been sealed and it takes intense practices to open them properly and this is dangerous. The crown chakra in Ayurveda is the gate to the pineal gland the awakening of the systems of the crown bring what is called the intense bliss state and expanded consciousness states of Samadhi. The numerous rituals of the Jewish enemy are designed to bind the Gentile soul this includes the crown chakra. The enemy knows the power of the crown and they glorify this for themselves in their own occult books while attacking this for Gentiles. The enemy spell book the Torah puts numerous bindings on the Gentile Kundalini system which includes the chakras this is also referenced to the bindings on the serpent in the Garden of Edin the tree with the serpent is the ancient symbol of the Gentile soul with the risen serpent and the symbol of the ancient Gentile spiritual order of the Brotherhood of the Serpent. Its also the totem of Enki who is called Satan. The Jewish "god" speaks curses on the serpent these curses are in Hebrew and "god" SPEAKING is the Jews themselves speaking the curses on the Gentile soul with Hebrew. The Jews openly call themselves "god" in the book of Psalms this is also referenced again by the enemy character of Rabbi Yeshua [Jesus] when he tells the Jews "they [Jews] are all Gods" and its as he stated in the book of Psalms. The character of Jesus takes credit for being the author of the Torah which calls Gentiles animals openly and instructs the Jews to destroy them and make them slaves. Then comes back to create another program to do this called Christianity.
The crown in the writings of Satguru Sivaya Subramuniyaswami this he calls the crown chakra the Manas chakra. Manas means moon and the full moon is the symbol of Ather in the east which connects into the crown charka meaning. In the eastern texts Ma, Man and thus Mana is the name of the crown chakra mantra this is also spelled as Manas in the east and west in the runes. The Aum in the crown had the M removed as well its also spelled as Maum in the rare texts. Shiva rules the crown chakra in the east and thus the Eye of Shiva and how this connects to the crown. Manas in the very ancient Hindu tradition is the daughter of Shiva. The Shakti or power of Shiva the crown chakra. Manas as the mantra is for opening the crown chakra.
wiki Satguru Sivaya Subramuniyaswami 
Merging With Shiva, Satguru Sivaya Subramuniyaswami
Layayoga: The Definitive Guide to the Chakras and Kundalini by Shyam Sundar Gowsami. Shyam Sundar Goswami