Awaken can be used either transitively or intransitively.
In passive voice, transitive verbs can be used without a direct object, because the thing the verb acts upon becomes the subject. Note, however, that as John Lawler pointed out in the comments, sometimes the indirect object can become the subject, in which case the verb will still take a direct object.
However, only transitive verbs can be converted to passive voice, which means that, even though they may no longer be shown with a direct object in passive voice, verbs that are used in passive voice are always transitive.
Edit: I have to walk back my statement somewhat. Sometimes the object of a preposition can also be used as the subject in passive constructions, and then intransitive verbs can be in the passive voice, too. For example, the verb to laugh is always intransitive, but it's possible to use it in a passive construction, as follows:
Active: Everyone laughed at him.
Passive: He was laughed at.
When an intransitive verb is used in a passive construction, it will be followed by a preposition. When a transitive verb in used in a passive construction, it won't.
In the end, though, if you're trying to illustrate a point about transitivity, I would generally suggest not illustrating it with an example in passive voice. I think it makes it much harder to understand.