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

See also: alert, awake, watchful

• penne
• penni
• penniless
• pennilessness
• Pennine Chain
• Pennines
• penning
• Pennisetum
• Pennisetum Americanum
• Pennisetum cenchroides
• Pennisetum glaucum
• Pennisetum ruppelii
• Pennisetum setaceum
• Pennistum villosum
• pennon
• pennoncel
• pennoncelle
• Pennsylvania
• Pennsylvania Dutch
• Pennsylvanian
• Pennsylvanian period
• penny
• penny ante
• penny ante poker
• penny arcade