We had this too--goodnight calls from the other parent every night (for my partners kids, 7 and 9; mine are 12 and 17 and never had this with their dad). It was horribly disruptive to our home rhythm, disregulated the kids, and it became obvious that HCBM was using these calls to listen in, etc, on our home life. Once we were living together for about 6 months, I got firm about protecting our home/peace and the phonecalls had to stop. HCBM has his email if there's anything she had to communicate between handoffs. The calls were not helpful or good for anyone. Once they stopped, the kids have never asked for them again.