Abstract: Smart mattress topper system and method that uses a smart mattress topper connected to the Internet (IoT), which includes a data processing architecture to collect, classify, storage and analyze the data gathered by the topper, other external devices and the user interface, where the smart mattress topper system, through an Artificial Intelligence (AI) module, and using two main calculated indicators, specifically, the sleep quality and the aggregated recovery, and, when available, other secondary inputs, makes recommendations and when possible, acts over the own topper and other connected external devices in order to continuously improve user sleep quality and recovery level to face in the best optimal state, each day challenges.