lethargy

noun2

1. •
   A state of extreme torpor, sopor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness.

   • Europe lay then under a deep lethargy. — 1687
2. •
   A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns.

   • This Apoplexie is (as I take it) a kind of Lethargie, a sleeping of the blood, a horson Tingling. — 1599