Insomnia — psychological causes account for what percentage of cases?

• A. 25%
• B. 50%
• C. 10%
• D. 75%

Answer: (B)

Psychological factors often drive insomnia, and about half of insomnia cases are linked to stress, anxiety, or mood disorders. This reflects how emotional arousal and cognitive worry at night can make it hard to fall asleep or stay asleep, while poor sleep can, in turn, worsen mood and anxiety in a cycle. The other half tends to arise from non-psychological factors like medical conditions, medications, caffeine or alcohol, poor sleep hygiene, and irregular schedules or circadian rhythm disruptions. So, the best estimate is that psychological causes account for roughly 50% of cases. The other percentages either overstate or understate the role of psychology relative to these non-psych factors.