What causes narcolepsy and nonsomnia?

I never heard of nonsomnia nor can I find it at the medical websites. I think you mean insomnia.

The cause of narcolepsy is not known; however, some experts think narcolepsy may be caused by a deficiency in the production of a chemical called hypocretin by the brain. In addition, researchers have discovered abnormalities in various parts of the brain involved in regulating sleep which seem to contribute to symptom development.

According to experts, it is likely narcolepsy involves multiple factors that interact to cause neurological dysfunction and sleep disturbances.

Causes of acute insomnia can include:

Significant life stress (job loss or change, death of a loved one, divorce, moving).
Illness.
Emotional or physical discomfort.
Environmental factors like noise, light, or extreme temperatures (hot or cold) that interfere with sleep.
Some medications (for example those used to treat colds, allergies, depression, high blood pressure and asthma) may interfere with sleep.
Interferences in normal sleep schedule (jet lag or switching from a day to night shift, for example).
Causes of chronic insomnia include:

Depression and/or anxiety.
Chronic stress.
Pain or discomfort at night.
What Are the Symptoms of Insomnia?
Symptoms of insomnia include:

Sleepiness during the day.
General tiredness.
Irritability.
Problems with concentration or memory.