The clinical trial has received approval from Israel's Ministry of Health.
60 per cent of respondents also said they would consider cannabis as an alternative to traditional medicine.
A pilot study was carried out in young people with treatment-resistant anxiety.
Fox is best known for his long stint on Channel 4’s SAS: Who Dares Wins.
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Up to 10 per cent of people in the UK are thought to suffer from insomnia.
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The cannabis-based drug is prescribed on the NHS to treat spasticity in multiple sclerosis (MS).
Support for legalisation was also up 16 per cent compared to data from 2010.
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