A bit of a medical question from Angela Howard:

What causes insomnia?

There are a number of things that can cause, or contribute to, insomnia. These include:

• Stress, depression, anxiety or grief.
• Physical illness such as asthma or pain.
• Noise or discomfort.
• Some medicines.
• Stimulants such as caffeine.
• An irregular sleep routine.
• Alcohol

There are other causes, too, but I think I’ve got the main ones. As to what to do about it, that really depends upon the precise cause. If it persists, though, I’d definitely recommend talking to your doctor.