Putting the computer in "sleep mode" or turning it off completely...are just two different options. "Sleep mode" obviously has the advantage of "waking up" the computer faster.
I agree with member "pendlewitch". I recommend turning off your notebook computer when traveling especially for folks who carry it about in a back pack. After all, how long does it take to boot it up? Is a minute or less going to make that much difference? It might just save you from a large repair bill.
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