Insomnia is considered a sleep disorder. sleep technicians use a variety of techniques to determine the underlying cause(s) of this condition in an insomniac. which of the following is not one of the causes of insomnia

amnesia

Explanation:

Insomnia is a sleep disorder in that occurs in human with the attribute of being unable to sleep. People having insomnia tends to have difficulty falling asleep, or staying asleep as long as desired. It can be followed by depressed mood sometimes.

Sleep technicians use a variety of techniques to determine the underlying cause(s) of this condition in an insomnia such as Nasal allergies , hyperthyroidism , asthma, Neurological conditions such as Parkinson's disease , sometimes psychological re-occurrence of fright from from fearful scene in the brain memory. etc.

From all these stated, amnesia is never said to be a  cause of insomnia. This is because; Amnesia is said to be the loss of memories. e.g facts, dates, information. etc Amnesia can range from mild to severe in some cases. The inability to recall the occurence of events after a period of time (amnesia) can be caused by brain injury, or aftermath effect of drugs and alcohol.