(HealthDay News) -- 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.