The blue hour comes from the French expression l’heure bleue, which refers to the period of twilight each morning and evening where there is neither full daylight nor complete darkness. The time is considered special because of the quality of the light at this time of day. The phrase is also used to refer to Paris immediately prior to World War I, which was considered to be a time of relative innocence.
In English culture the term was used to describe the period of inactivity and uselessness a drinker encounters when Pubs and other licensed premises have closed after the lunch-time session (typically 15:30 hrs) and will not open for the evening session until (typically 18:30 hrs).
The Daily Omnivore 
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