It's bad for your eyes to read books in the bed.
on the bed 没有睡着，或者在床上但是没有躺下
in the bed 睡着了，或者是躺在床上,特别是在床上呆了一阵子了
所以正确答案就是：
Reading in bed is bad for your eyes!
Reading in bed is bad for your eyes.
Reading in bed is bad for your eyes
Reading
eyes
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