English Translation
I usually study at night.
this should be usualmente not normalmente
I’d say this is a case of kind of a false friend. Although “usualmente” does exist, at least in spoken (and i’d tend to say that it is also the case in written) “normalmente” is much more common, and is used both as “usually” and “normally”. I’e go as far as say that i’d probably use “habitualmente” over “usualmente” if I had to avoid “normalmente” (but maybe that’s a matter of personal preference).
Regarding dictionnaries, DLE (see normalmente and usualmente) seems to lean rather the opposite of what I said 
. But the wiktionnary’s definitions (usualmente and normalmente) go more towards my experience. So there’s that
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