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What are the main causes of insomnia?
Personal Opinion
An individual's specific thoughts or beliefs about a subject, which may not be based on fact or knowledge and can vary greatly from person to person.
Empirical Proof
Evidence that serves to either support or counter a scientific theory or hypothesis, obtained through direct observation or experimentation.
Operational Definition
A clear, precise definition of a term in a study, based on the specific operations or procedures used to determine its presence.
Observed And Measured
The process of collecting data through direct observation and quantification of phenomena or behaviors.
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