Can I restore a deleted iMessage conversation

Hello mphoak,

Thank you for using Apple Support Communities.

I understand from your post that you would like to restore an iMessage from last night that was deleted. If you regularly create a backup file using iTunes or iCloud, you can restore the latest backup file to get your message back.

This article has the steps to restore either your iTunes or iCloud backup to your iPhone:

Restore your iPhone, iPad, or iPod touch from a backup

Best Regards