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

See also: alert, awake, watchful

• mitsvah
• mitt
• mittelschmerz
• mitten
• mittened
• Mitterrand
• mittimus
• mitzvah
• Miwok
• mix
• mix in
• mix-up
• mixable
• mixed
• mixed bag
• mixed blessing
• mixed bud
• mixed doubles
• mixed drink
• mixed economy
• mixed farming
• mixed marriage
• mixed metaphor
• mixed nuisance
• mixed-blood