How is there not a pad I can put on my daughters mattress or under it to keep it vibrating ALL…

How is there not a pad I can put on my daughters mattress or under it to keep it vibrating ALL NIGHT. All I can find is the munchkin lulla-vibe thing and that only last 30 minutes at a time!! I need something to last ALL NIGHT. I guess I'll keep using my neck massaging dog thing till I find one.. Unless someone knows where to get one! At this rate she will never sleep in her crib all night.