I have two complete sentences; the second is in parentheses, essentially a comment on the first. Where do I place the periods? I would use this:
They played opera. (I covered my ears.)
Is this punctuation correct?
Punctuation within parentheses
If your parentheses enclose a sentence-within-a-sentence, don't use a period within the parentheses. Do, however, use a question mark or an exclamation point if it is called for.
If the parentheses enclose a complete sentence that stands alone, keep the period within the parentheses.
The punctuation marks are correct.