Description: Plenty of sleep is a vital part of a healthy lifestyle. But most people have sleep problems at some point in their lives.

Here are common causes of insomnia, courtesy of the National Sleep Foundation:

Stress, depression or problems in work or personal life.
Drinking alcohol or caffeine late in the day.
Exercising too close to bedtime.
A distracting sleep environment -- one that's too bright, loud, or caused by sleeping near another person.
Physical conditions, such as arthritis, backache or pregnancy.
Certain medications, including steroids, decongestants, blood pressure drugs, asthma drugs and antidepressants.