tiredness

from WordNet (r) 3.0 (2006)

tiredness
    n 1: temporary loss of strength and energy resulting from hard
         physical or mental work; "he was hospitalized for extreme
         fatigue"; "growing fatigue was apparent from the decline in
         the execution of their athletic skills"; "weariness
         overcame her after twelve hours and she fell asleep" [syn:
         {fatigue}, {weariness}, {tiredness}]

from The Collaborative International Dictionary of English v.0.48

Tiredness \Tired"ness\, n.
   The state of being tired, or weary.
   [1913 Webster]