browsing in bed? = iPad
I'd say iPad mini. The iPad is quite heavy to hold up, and it keeps slipping out of my hands.
Although I can't imagine how someone use a laptop "in bed laying on the back with the MBA on the chest"... Try it with another laptop, your neck will be sore in 10 minutes.
You might use your to elevate your body (so you're not lying flat) and use the laptop on your lap. In this case, I'd opt for the 13 inch for the larger screen and better battery life.
There is no point of using an 11 inch as portability is not an important factor. Plus, the larger screen will fill your vision more at night.
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