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dedoubt t1_j18byss wrote

>insomnia is very much psychological

There are so many causes of insomnia, it is not purely psychological. That's like saying stomach aches are "very much psychological".

Chronic insomnia may also be associated with medical conditions or the use of certain drugs.

Medical conditions. Examples of conditions linked with insomnia include chronic pain, cancer, diabetes, heart disease, asthma, gastroesophageal reflux disease (GERD), overactive thyroid, Parkinson's disease and Alzheimer's disease.

Sleep-related disorders. Sleep apnea causes you to stop breathing periodically throughout the night, interrupting your sleep. Restless legs syndrome causes unpleasant sensations in your legs and an almost irresistible desire to move them, which may prevent you from falling asleep.