twinkling
noun /ˈtwɪŋklɪŋ/
  /ˈtwɪŋklɪŋ/
[singular] (old-fashioned, informal)Idioms - a very short time
- He was asleep in a twinkling.
 
Oxford Collocations DictionaryTwinkling is used before these nouns:- eye
 - light
 
 
Idioms 
in the twinkling of an eye 
- very quickly synonym instant (1)
- Suddenly, in the twinkling of an eye, her whole life had been turned upside down.