When did wakes move to funeral homes?

In the twenties and thirties, viewings of the deceased made the transition from the home parlor to the funeral parlor. One can credit or blame either the Depression- a down angle indeed ( l929-38) or Detroit- automobile accidents posing some damage control problems best handled behind closed doors- but restorable. Either cause could be true. Religious sisters are traditionally laid out in convent chapels so the home-wake custom is not totally extinct.