Siesta, e.g. is a term used to describe a short NAP taken during the day, usually in the afternoon. The crossword solutions for this term are REST (4 letters) and NAP (3 letters). REST is an acronym for 'REST and Exercise Simultaneously To Achieve' and is a form of relaxation that involves both physical and mental REST. NAP is an acronym for 'Napping Afternoon Period' and is a period of time dedicated to taking a short NAP. Both terms refer to the same activity of taking a short NAP during the day.