Lack of sleep will cause a lot of health problem, here is the list of possible health problems that may occur:

Lack of alertness. Even lacking as low as one and a half hours will affect the way you feel.
Excessive daylight sleepiness. It could make you very sleepy and worn out during the day.
Impaired memory. Lack of sleep can affect your capacity to think, remember and process information.
Relationship stress. It could make you feel moody and you could become much more likely to have conflicts with others.
Quality of life. You may also turn out to be much less possibly to participate in normal daily activities or to exercise.
Greater probability of vehicle accidents. Drowsy driving accounts for thousands of crashes, injuries, and fatalities every year, according to the National Highway Traffic Safety Administration.
If you preserve operating without sufficient sleep, you could see more long-term and critical health troubles. Some of the most critical possible problems related to chronic sleep deprivation are high blood pressure, diabetes, heart attack, heart failure, or stroke. Other possible problems include obesity, depression, and decreased immune system function.

Chronic sleep deprivation may even affect your appearance. Over time, it may result in premature wrinkling and darkish circles under your eyes. There's also a link between lack of sleep and an increase in the amount of the stress hormone cortisol in your body. Cortisol can break collagen, the protein that keeps pores and skin smooth. In other words, a lack of sleep should mean more wrinkles!

Read NATURAL WAYS TO PREVENT INSOMNIA for more info!