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

See also: alert, awake, watchful

• Alan Jay Lerner
• Alan Lloyd Hodgkin
• Alan Mathison Turing
• Alan Paton
• Alan Seeger
• Alan Shepard
• Alan Stewart Paton
• Alan Turing
• alanine
• alar
• Alaric
• alarm
• alarm bell
• alarm clock
• alarm system
• alarmed
• alarming
• alarmingly
• alarmism
• alarmist
• alarum
• alary
• alas
• Alaska
• Alaska cedar