1
general::
Phrase(s): sleep through something
to remain sleeping through some event. • I didn’t hear the storm. I guess I slept through it. • Wally slept through the entire opera—even the loud part.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Sleep without waking for a period of time, usually the night, as in At three months many babies have learned to sleep through. [Mid-1900s] 2. sleep through something. Fail to pay attention, as in We all slept through the explanation and then had trouble getting the machines started.
American Heritage Idioms