Accidie

[ pronounced Assidee or aCEEdia ]
Word from early days of Christianity among those living in the desert, describing a feeling of lethargy and despair (like after lunch sluggishness), caused by demons who came out to infect them at lunch time.

• From the TEDTalk below (at about 4:50), by Tiffany Watt Smith, which includes a bunch of emotions where there are no words in English, but which you may well have experienced, but never had one single word to describe them! Or which you may go out and try to see if you can conjure up the feeling from hints in its definition for where and/or under what conditions one might experience it.

This one is also common enough to use in everyday life to describe how you’re feeling, after lunch on work days probably, to remember easily through repetition.