## 5 Results and Discussions  
The results from the experimental campaign had as first objective the possibility to confirm or not the general expected output of what is commonly accepted as a \"normal\" behavior of the persons that belong to the morning or evening chrono-type circadian, i.e., it could be important to validate the use of the previously introduced technology that the experiment confirms what is commonly expected by the people in terms of fatigue appearance. To measure the results of the experimental campaign in this sense, we decided to count the number of the outcomes for each person of two main sets, constituted by the morning and evening circadian chrono-types, and then divide this count for the total number of the experiments performed. With this main objective, the experimental set was tested as previously introduced and some comforting results were collected. First, let us to show the results for the people that belong to the morning circadian chrono-type. As it is possible to understand in the international literature about the chrono-types, the morning circadian chronotype generally includes subjects over the age of 35; in them, there is a lower level of fatigue found in the morning compared to the evening circadian rhythm. In the experiments this trend was confirmed having a continuous fatigue increases during all the time span of observation from the morning to the evening, so it is possible to say that the experimental campaign results confirm what is available in the literature about the fatigue answer by this kind of chrono-types. In particular, note that in the recordings made after the lunch break, a level of fatigue almost double compared to the morning, continuing to increase until the afternoon but with less intensity. The subjects interviewed following the outcome of the analysis, confirmed an effective perception of personal drowsiness was found very accentuated precisely in that time slot (i.e., from 14 to 14.30). Most of the non-detected category is due to the frequent distractions in the workplace (such as phone calls, social interaction with colleagues) that are quite common for the category of employment chosen for the analysis. It is also interesting to note that after such distractions, in most cases the evaluation of the program was of Non-Fatigue. Following the results for the morning (Figures 5-7), the first period after lunch and the closing hours of the working day are represented and finally, a general diagram for the fatigue level in the time horizon of the working day is presented. After the presentation of the experimental results for the morning circadian chrono-type, let us introduce the results for other main experimental sets, i.e., the evening circadian chrono-type (Figures 8-10). In this category all subjects under the age of 35 are grouped and the number of subjects investigated is homogeneous with the other main set. The subjects, belonging to this kind of chrono-type are, generally, characterized by showing a slightly higher level of fatigue during the morning. They have an almost constant trend even in the post-lunch break time, in fact, the program  
Figure 5: Results of the experiments in the morning for the morning circadian chrono-type. detects a level of fatigue almost equal to the one observed in morning records. In the records carried out in the time slots between 4.30 and 5.00 pm there is a noticeable increase in fatigue which, however, is lower than the same as in the morning rhythm. Moreover, in this case, the subjects interviewed in the post lunchtime slot, do not feel excessive fatigue; it is, however, worth to note that many of them declare to consume light lunches, so maybe this chrono-type is also characterized by different habits. The trend of the daily fatigue observed is also foreseeable in the scientific literature, so the fatigue follows the expected trend.