1. Fully awake
   "so excited she was wide-awake all night"
   - unsleeping 
2. Fully alert and watchful
   - heads-up

See also: alert, awake, watchful

• gasfield
• gash
• Gasherbrum
• gasification
• gasified
• gasify
• Gaskell
• gasket
• gaskin
• gaslight
• gasman
• gasmask
• gasohol
• gasolene
• gasoline
• gasoline bomb
• gasoline engine
• gasoline gage
• gasoline gauge
• gasoline mileage
• gasoline pump
• gasoline station
• gasoline tank
• gasoline tax
• gasometer