There are several articles about "effects of lack of sleep" on the body.
Here is an extract from one of the articles
Three Factors to Determine How Restorative Your Sleep Is
The Importance of Getting Bright Light During the Day
Nighttime Light Exposure Is Also Detrimental for Sleep and Health
Moderate Weight Loss Can Help Prevent Sleep Apnea
You Don't Have to Be Obese to Suffer from Sleep Apnea
Quick Tips for Improving Your Sleep Quality
If you want the full article, go to MERCOLA.com and search for "lack of sleep"