The curfew must have been relaxed somewhat cause here are some other noteable changes.

1st YVR-YYZ red-eye, now sked arr time 05:53
1st YEG-YYZ red-eye, now sked arr time 05:51
1st YYC-YYZ red-eye, now sked arr time 05:45
LAX-YYZ red-eye, now sked arr time 05:41
SFO-YYZ red-eye, now sked arr time 05:43

these arr times are pulled from the sked around late JUN.