Do mail handlers generally work from late night to early morning?

Basically I know mail carriers in them orning have to come get their particular stack set aside for them and organize and load it up, but if thats the case does it mean mail handlers work the late night early morning along with mail sorters?

Do mail handlers generally work from late night to early morning?theater

Yes, the mail handlers usually work the graveyard shift....loading and unloading the tractor-trailers......