Hi there,
Have you ever heard of using flower essences for your children? These are homeopathic-type remedies that can be very helpful in easing emotional ups & downs & also traumas. They are inexpensive, do not have side effects, & very safe for children. It would probably be very helpful to ease night terrors, as well as being a preventative before both your kids go to sleep. You might use some yourself, as you go through the divorce process, and look up Walnut flower essence as this helps with big changes and adjusting to new situations. Walnut also helps protect a person from other peoples' influences, so would be helpful for the kids as they adjust to their new parenting situation.
Flower essences are NOT essential oils or herbs; they have no odor and work on a very subtle, vibrational level.
The one I would recommend you look up is Rescue Remedy, or Five-Flower Formula, specifically designed for shock or trauma. You can look up either Bach Flower Essences, or the Flower Essence Society & buy essences for yourself or your children on the site, or check at a Whole Foods Market or Co-op to buy them. They cost about $5-10 per bottle, depending on what size you get.
Hope this helps!