I work 3pm to 11pm and cannot get to sleep by 2am. it is getting later and later, some nights 5am. how can i break this pattern?

Swing shift: What you've described is swing shift work, and this is often thought of as the most disruptive impact on sleep. It's like having jet lag that doesn't go away. See if you can get regular shift work. Generally speaking the human body was designed by evolution to work during the day and sleep at night, as part of normal circadian rhythms.

Sleep hygiene.: You need to get back on a schedule for sleep. To reset your sleep clock, go to bed at the same time every night, awaken at the same time every morning, don't nap during the day, use the bed for sleeping (not eating, TV watching, reading, etc), if you awaken during the night, stay in bed until your determined awakening time. Shoot for 6 to 9 hours of sleep nightly.