rouser

from WordNet (r) 3.0 (2006)

rouser
    n 1: someone who rouses others from sleep [syn: {waker},
         {rouser}, {arouser}]

from The Collaborative International Dictionary of English v.0.48

Rouser \Rous"er\, n.
   1. One who, or that which, rouses.
      [1913 Webster]

   2. Something very exciting or great. [Colloq.]
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   3. (Brewing) A stirrer in a copper for boiling wort.
      [1913 Webster]