
Does this mean that he usually gets out of bed at six-thirty (possibly even using his alarm clock to make sure he doesn't oversleep) or that he always automatically wakes up at that time and cannot sleep any longer? I would usually assume it's the latter, but every so often I see "wake up" used in places where I'd normally expect "get up".

In my eyes, you have posed the best question of the day.
>>...where I'd normally expect "get up".<<
I feel the same way. But maybe another good question is: Are we entitled to expect anything at all in English, a language where so much is up to imagination, experience and background knowlegde.
The more I'm looking forward to a native speakers response.

This means he stops sleeping at 6:30. This could be naturally or by using an alarm clock.
People do often use this interchangeably with "get up."
Usually people mean "get out of bed" when they say "get up."
The following sentence shows the difference.
Tom usually wakes up at about six-thirty, but he doesn't usually get out of bed until seven.
http://tatoeba.org/eng/sentences/show/2750577
@al_ex_an_der,
>Are we entitled to expect anything at all in English ...
No, I don't think so, but as with learning any foreign language, you should expect the unexpected, I think.
In this case, "wake up" and "get up" are used interchangeably at times probably because many people do them almost at the same time, so even though there is a difference in meaning, these questions can be pretty much used in conversation with the expectation of getting the same answer.
What time do you get up?
http://tatoeba.org/eng/sentences/show/24579
What time do you wake up?
http://tatoeba.org/eng/sentences/show/2750613

Thanks for the explanation. ☺
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