For months, I have very strange sensational meditative experience. The sensation will flow from my head to my body, I felt a bit uncomfortable, and there is a sense of sweetness in it. In a way, I look forward to it, and yet feeling not comfortable about it. After the meditation, I can not go back to sleep, I would be awake for hours. I had the same kind of sensation about two night's ago. I therefore decided to ask Dr. Jonathan parker. Here is his response and it certainly looks like a good thing.
Dear Ming,
From what you explained in your email it sounds to me that you experienced a connection with the God Presence...which may also be called the Higher Self or Soul. There is a definite sense of Presence about it when it comes to the surface, and it is usually the most intense the first few times it happens, and, yes, it can keep you awake at night. Most people welcome it and even look forward to it. After some time (weeks or months) you adjust to it and your experience can then shift more into bliss or euphoria. After a bit more time (weeks or months), you will shift higher and enter a very deep stillness and peace.
The best way to deal with it is to surrender to it. You can repeat softly to yourself, "I surrender and release all resistance." Repeat this like a mantra for a few minutes and then observe the energy filling you. By bringing your attention to different parts of your body, the energy will fill it and dissolve or heal issues there. You can also bring up issues you may be working on and the energy will help dissolve and heal them. You could also do other mantras at this time to bring the experience in more fully or alter the frequency. The mantras I most recommend are those with an "ahhh" sound, such as Rama, Buddha, Allah, Jehovah, Ahh-ooom. so-ham, or others. The "ahhh" sound helps open the heart to the God Presence. As you do this you should keep your focus on the center of your chest. You can put one or both hands over this area and you will feel the presence expand.
If you find the sensation uncomfortable, you may be able to diminish the effect by getting up and doing something active, although if it happens in the middle of the night I can see this may not be convenient or desired. Because the energies are quieter at night these experiences are more common then. For this reason some people on spiritual paths intentionally wake up and do meditations between 2 - 4 a.m.
In time it will come more under your control and you will be able to turn it on and off whenever you want, but in the beginning it often takes a person by surprise and comes over them at random times. It's a good thing that many people work a lifetime to achieve. Consider yourself blessed.
With love & light,
Jonathan