Where do you drill holes in waterbed frame for a sleep number mattress?

When drilling holes in a waterbed frame for a Sleep Number mattress, ensure you do so at the head and foot of the frame to accommodate the air chambers. Typically, you should drill holes that align with the mattress's air chamber ports, usually located on the sides. Use a drill bit that matches the size of the ports to ensure a snug fit, and avoid drilling too close to the edges to maintain the frame's integrity. Always check the manufacturer's guidelines for specific instructions regarding your mattress model.