ive had that happen to me manytimes were my head vibrates like that when i smoke weed.my head feels so good when its vibrateing and i know i stepped into something awsome.but it dosnet last long.comes and goes not everytime i smoke weed just some times and more with certain weed.i see 11.11 alot and 1212 222 333 444 ....dont know if its a conection or not.also was able to go into a sleep ,different then regular sleep and leave my body and fly around the house and other places at will.