Lexapro And Fatigue

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I have been on 10 mg of Lexapro since February 10th. I started taking it around 10am, this last week I started taking it at night. I feel awesome but I also feel like I could sleep 24 hrs a day! I 've read where some people were over the fatigue in 4 weeks, has anyone had it longer? Should I cut it down to 5mg?.