Fig. 9. (a) Ambient intelligence system aimed to take care of the night sleep
involving RFID tags placed over the body and in the surrounding environment.
(b) Example of a trace recording the sleep activity (raw and processed signals) and
producing warning in case of falls and anomalous absence. For each quiet sleep
condition, the different body postures have been classified as ,
,Right side ,down, and . (c) Example of aggregated
statistics.