Night shift and OPKs

Carly • 26, Labor & Delivery RN, Married 2 years and TTC #1 :)
I am a night shift nurse, and I work three 7p-7a shifts a week. What would be the best time to use an opk for me when I'm working? I've heard 12-3 in the afternoon is best during the day, so should I do it around midnight-3am on nights I work?