The 7th chakra is the Crown or Sahasrara, which translates to "thousand petaled." This chakra is pure consciousness energy. The Crown chakra is one of those energies that’s hard to explain. You can think of it like magnetism. When you hold a piece of metal to a magnet, you can feel the energy and tension, but you can’t see it. Consciousness energy is everywhere and in everything. It connects us to the entire universe. Our own personal consciousness is located in the 7th chakra, but it’s really more like the seed of a universal energy than something personal or individual. Location: The crown chakra's center is at the top of your head. It radiates down to between your eyes and then extends infinitely upward and outward, connecting you to energy of the rest of the universe. What balanced feels like: Achieving a balanced crown chakra is the goal of every spiritual warrior, and it's not easy to do. You can think of it like the Buddhist concept of achieving nirvana. Once you achieve it, you’re not really human anymore - you’ve conquered suffering and death. Of course, it is the journey of attempting to achieve this balance that brings us happiness, good health and wisdom. Trying to balance your 7th chakra will align and balance your other chakras.
It’s not possible to have an overactive crown chakra. Because it is the sent of universal energy, it is innately infinite. In other World, you can’t exist in the material world and be overcome with consciousness energy.
Since no one has an overactive crown chakra, there’s no need to consider how to calm the energy down.
An underactive 7th chakra means you’re human. It feels exactly like being a human. Some people may be closer to achieving it, while others may be far away. In any case, practicing spiritual development and balancing your other chakra will bring your closer to experiencing the consciousness energy in your crown chakra.
Instead of attempting to open up and active your crown chakra, focus on balancing the other 6 chakras. Meditate and connect with spirit and balance those activities with living and enjoying your human experience. Think of it like trying to win an Olympic gold medal. You don’t just try to win the medal; you train your body and mind first. The only way to achieve such a huge goal is to focus on small, attainable goals first. The same goes for trying to open your crown chakra. Don’t just attempt it; focus on maintaining and balancing all the other energies in your body.