Psychophysiological insomnia: Somatic tension and agitation are difficult to calm. Anxiety and depression are not severe, negative emotions are suppressed, and only sleep is a concern. Sleep-related conditioned stimuli (e.g. bed, bedroom) cause insomnia, also known as “conditioned insomnia, acquired insomnia”. The more you try to sleep, the more agitated, confused, and unsettled you become, and the harder it is to fall asleep. On the contrary, it is easy to fall asleep when you are not trying to sleep (e.g. watching TV, reading, on the living room sofa, in a hotel, at unconventional sleeping hours, etc.). It mostly starts in 20-30 years old and is more common in women. Accounts for about 15% of insomnia. Excessive parental attention to sleep or health problems may be a risk factor. Often chronic, lasting years to decades. Prone to drug, alcohol, coffee, etc. abuse. Be alert to the possible underlying anxiety and depression behind insomnia.