(as) quick as a wink

:  not dead :  living, alive

:  acting or capable of acting with speed: such as

:  fast in understanding, thinking, or learning :  mentally agile

:  living beings

:  a painfully sensitive spot or area of flesh (such as that underlying a fingernail or toenail)

:  the inmost sensibilities

:  in a quick manner

:  to shut one eye briefly as a signal or in teasing

:  to close and open the eyelids quickly

:  to gleam or flash intermittently :  twinkle

:  a brief period of sleep :  nap

:  a hint or sign given by winking

:  an act of winking