<human>: Can you summarize the given text in a few sentences?

A few times in my life I have randomly experienced a strange sensation that seems to creep from the top of my spine to the center of my brain. It's like a trickle that suddenly 'explodes' in the center. It gives me a sensation that feels like i'm being lifted out of my body similar to those falling dreams where you wake up and feel like you're falling. Almost exactly like that.

Anyway, recently i've found that I can revisit that sensation on command. I concentrate for a while, meditate - if you will, and the sensation starts but when it reaches it's climactic burst I break all concentration as it is just incredibly overwhelming.

What the heck is going on?
<bot>: tingling sensation in brain, climactic 'pop', overwhelming sinking/falling feeling. can make happen to self. wtf?*