little red train,
The "falling asleep" trick takes me back to my own PPL XC training. The instructor, a rather wonderful old greybeard (well, to a youngster it seemed thus - he would have been early 40s), faced with a student with too much overconfidence (me) brought me down a peg with the following trick .... in a 172, if my memory serves me correctly, reading his paper intently, dropped a pen .... in picking it up ... of course ... turned the fuel tap off.
As I recall, the student's overconfidence evaporated for just a second or two when the noise stopped ....