Sorry- I didn't see the help you offered, Dr. Mark. The answer is 'both'. I think. And overnight, I indulge in one VERY LONG blink. With both eyes.
I'm afraid Robin has it right and the only sane response is
Laaa, lala! Laaaa la lala!
La lalalalalalalalala!
Laaa, lala! Laaaa la lala!
La lalalalalalalalala!