Welcome to the forum ... and to the world of physical change.
One incentive for you to lift is that it will help you sleep more deeply, and more regularly. Since you work from 3 PM until midnight, you'll definitely want to schedule your workout BEFORE work, not after. You don't want to elevate your metabolism just prior to going to bed.
What are you doing now during your workouts?
How do you currently eat?
Do you know what to change?