Tired drivers can be as impaired as drunk drivers:

• Because they have a slower reaction time and are less alert
  Explanation:

  "Tired drivers can be as impaired as drunk drivers because they have slower reaction times and are less alert. Fatigue affects cognitive functions, making it harder to concentrate and react quickly to road hazards. This increases the risk of accidents, similar to the effects of alcohol impairment."
• Because they have raised blood alcohol levels
• Because they are more active than a normal person
• Because they have raised body temperature