Parasomnias

• Parasomnias include involuntary actions such as sleep walking, sleep eating and sleep driving. While sleep walking and sleep eating aren't too dangerous, sleep driving is life-threatening for the driver and others on the road.
  
  

Digestive Troubles

• Constipation, diarrhea, nausea and vomiting are all effects of sleeping pills. In some cases, these lead to decreased appetite, which may lead to malnutrition.
  
  

Dreams

• According to WebMD, unusual dreams are one of the effects of sleeping pills. These dreams are considered a preliminary warning of parasomnias.
  
  

Daytime Effects

• According to Philips, the day after taking sleeping pills, you may still feel some of the effects of the pills, including impaired judgment, sleepiness, memory problems and drowsiness.
  
  

Dependency

• Some people will become addicted to sleeping pills, which is characterized by an overwhelming feeling of needing the pills to survive. This is a life-altering, and possibly life-threatening, effect.