>>You go to sleep and all that demand essentially goes away.
That depends. In the south where the heat pump cools our homes, the largest demands in the winter time are overnight. In fact, the electric grid gets overloaded on nights where the heat pumps can’t keep up.
I am in the south and my winter Bill is half my summer bill.
Peak probably comes when people start getting taking showers, cooking, drying hair and setting thermostats warmer.
EV charging would over by that time.