Health Tip: Can't Sleep?

(HealthDay News) -- If you have trouble falling or staying asleep, it's important to understand the reasons for your insomnia.

Here's a list of possible reasons for your sleepless nights, courtesy of the U.S. National Library of Medicine:

• Discomfort or illness.

• Depression.

• Stress or anxiety.

• Drinking caffeine or alcohol, smoking, or taking certain medications or illicit drugs.

• An inappropriate sleep environment, including one that's too bright or too noisy.

• Related activities that affect your sleep, such as taking naps or going to bed too early.