I've had the same problem with sleeping and depression (not same cause as you though).

Here are some tips I've found helped me through my sleepless depression:

-Warm glass of milk before bed.
-Stay away from TV, computer, or other sources of light where you have to stare into about 1-2 hours before bedtime. Read a book or magazine or listen to radio or something.
-Exercise, but Do NOT work out in the evening. Try working out in morning or afternoon. Also for your depression, working out will help you feel better in general and actually helps you sleep as well.
-Finish eating at least 1 hour before bedtime.

Hope it helps.

Seeing a therapist would help too, to deal with the depression.

Counsiling, Church, and started watching Joyce Meyer on TV. She shares experiences and how she had to let go, one of them you both went through. I bought the CD, Beauty for Ashes is good to hear. I also watch Sunday Morning Inspirational TV.. Joel Osteen, Charles Stanley, Creflow Dollar, Paula White, I took the positive views to push away the negative clouds that were pouring down on me. Look for the Positive.

Keeping yourself on a strict schedule will help as well. (Sleeping)