Task: Question Answering
Input (English): Context: This morning I woke up at 0420 after going to bed at 0030 . I felt in a fog and very tired all day and had to lay down two or three times I could stay coherent . I ' m limiting caffeine intake to one or two cups a day so the lithium is not nullified . Although I am concerned that because of the nardil half life of 12 hours I am missing part of my therapeutic does , I feel the night time dose of three vs. 1 day and 2 night is called for so I had the same amount in my bloodstream it is just tapering off during my waking hours . 
Question: Why did I decide to limit my caffeine intake for now ?
Output (English): I do n't want it to interfere with my medication .