Tolerance?: Codeine isn't a sleeping medicine but can make most people drowsy. If you take Codeine regularly, you may be developing tolerance.
Answered 6/24/2014
5.2k views
Look for caffeine: Many of the common (prescribed) preparations of Codeine contain caffeine, which could very likely be the cause of insomnia. Insomnia is also a possible side effect to the Codeine itself.
Answered 6/24/2014
5.2k views
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