10000 days- i have been getting that sensation since i was a little kid living in new jersey. i thought it kinda felt like some kind of rollercoaster so i let it happen. i felt that sensation and then it would kinda put me to sleep... but the key to using that to your advantage in WILDing is to not even notice it. try not even thinking about it after it hits you. still focus on counting your breaths. then after you get to the next metered number (like 150 or 100 or whatever is close thats all even an stuff), start thinking about visualizations to get yourself into the dream state. the transitional phase takes longer when you are WILDing without WBTB.... i hope i could help