Just wonder did anyone pray to 床母？and how did u go about doing it?

Great explanation. To add, for us we just light a joss stick on our bed and ask wang mu niang niang please protect our (LO name). Let him sleep good, thru the night.. Up to you what you want to offer (in terms of the vegetable). At the end of the offering toss 2 coins to see if it's 2 diff side - eg one head one tail means ok. If both same side wait awhile then toss again until it's different side.