@Shrinath Sir
Kundalini is actually described as The amount of energy stored at the bottom of root chakra.
This is always an eternal experience when kundalini rises upwards.
This energy makes you calm, relaxed, materialistic dettachements and freedom from worries.
According to scriptures or mythology it is called as Serpent
or we can say flow of Current through our Chakras from root chakra to crown chakra.
When kundalini rises upwards it causes lots of tingling, vibration through meridians. According to some yogis complete awakening of kundalini takes lots of meditation, practices and morever divine wish.
Once kundalini rises completely a person becomes highly able of what we called psychic powers.
Yours feeling are common with kundalini meditation not to fear much
Please don't do This or any other yoga posture or session at your bedtime.
Please must Request VK with Safety & Security for any mimicking.
You can also read wonderful description by @"Sharat Sir-VK Inventor" ji in this article
https://litairian.com/kundalini-yoga-poses-mudras-dangers-benefits-awakening-energy/