The very first thing I do when I wake up, as I'm lying in bed half-awake, is to reach behind my head, grab my hair and pull my head to the right. Most of the time (but frustratingly not all the time) this results in a loud audible release from the left side of my neck, somewhere between the base of my neck and about halfway up.
I need to do this before I can function properly. The jolt of it galvanizes me from drowsiness into wakefulness. It's like flicking a switch to turn all my systems on.