different between drowsiness vs inactivity

English

drowsy +? -ness

drowsiness (usually uncountable, plural drowsinesses)

From in- +? activity.

inactivity (countable and uncountable, plural inactivities)

The quality of being inactive; idleness; passiveness.
- 1994, Helene Barbara Weinberg, Doreen Bolger, David Park Curry, American Impressionism and Realism
  Painters depicted Idle Hours (see fig. 99), reverie, solitude, and other themes that reflected Americans' new willingness to eschew productivity, and they sold their canvases to patrons who enjoyed both the inactivities portrayed and seeing themselves portrayed in inactivities.

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