I WISH I could do something so bad. Because it just hurts to hear what you are going through. I am going to pray for you.
And, honestly - maybe the kids do need to be drugged just for a couple of nights. Or maybe you can have another relative or friend watch the kids for a couple of nights whether or not THEY are asleep, but so YOU can have a couple of nights and rest.
PLEASE get the sleep YOU need regardless. Because in order to care for those kids - you need to first make sure you are getting what you need.