G day there kev
you sound like my dog he sleeps with his eyes open I've seen his eyes follow my movement across the room yet if you give him a clap he wakes with a startle . Part of your brain having a wee rest maybe ? I am only guessing kev I don't realy know , but I'm sure of the tingle I get inside my head is caused by med aw well am signing off now you take care
lan