Our expert says:
Anxiety can be related to both chemical and psychological aspects of past surgery. Most medication offered to promote sleep has a possibility of producing dependency, so caution is wise. But as in most problems, the start to finding the best solution is an expert analysis / assessment and identification of the essence of the problem. A psychiatrist could help. Many of those who promote themselves as some sort of sleep Expert are essentially self-qualified, as this is not a recognized specialty with particular training or qualifications. Peaceful reading, milky drinks, non-stuffy bedroom air, relief of any post-op pain, treat exercise like coffee / tea / cola - not after 4 pm if you have sleep problems, etc.
And as Maria emphasizes, if your wife has anxiety problems, these always disturb sleep, and should be properly assessed and treated, with possible medication and surely counselling.
"Coffee" ( which otherwise keeps you awake especially if taken after around 4 pm !) gives sound advice.
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