Ms Nadeem,
Weed has a tendency to make people addicted due to psychoactive properties to induce Euphoria. But a long term use of weed is associated with various kinds of Mental and Behavioral disorders from mild severity to extreme severity.
In your fathers case, insomnia is just a symptom, but a you mentioned there are mood and behavioral changes as well, he needs a full evaluation and treatment under experts. A visit to a Psychiatric center with Deaddiction Clinic will help him. Any treatment ...
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