Tired drivers can be impaired as drunk drivers because:

• They have a raised body temperature
• They have a slower reaction time and are less alert
  Explanation:

  "Drowsiness has been identified as a causal factor in a growing number of collisions resulting in injury and fatality. Tired drivers can be as impaired as drunk drivers because they have a slower reaction time and are less alert."
• They are more active than a normal person
• They have raised blood alcohol levels