I. Obermiller and S. I. Ahamed 3 Nasal and oral airﬂow S S Patient noise levels Movement Patient temperature & movement M Mote and accelerometer: relays wirelessly with the main mote S Pulse & blood oxygen level M Main mote: records patient temperature and collects data from the other sensors Note: sensors and motes are enlarged for the purpose of the diagram Figure 1: Diagram of the sensor network used for nighttime monitoring. 3.3. Reliable Because we have designed our sleep monitor with long- term monitoring as an objective, the system itself must be reliable. It should be able to be used consistently for weeks or even months at a time without degrading in accuracy or requiring any maintenance on the part of the user. Although it is impossible to prepare for all situations that may occur, the system is easily customizable for any age of the user, allowing it to respond to unique needs more eﬀectively than a “one size ﬁts all” solution could. 3.4. Privacy aware Because there is a system that monitors sleeping habits and collects lifestyle data, it is natural that users would want to control the use of their conﬁdential information. Our solution allows the user to customize how their information is shared and who can have access to it. By default, only the doctor who will diagnose the user will have access to the information, and data on the system itself will be restricted to the speciﬁc user who collected it. 3.5. Simple yet meaningful GUI One of the major target age groups of an easy-to-use, portable sleep monitoring system is the elderly. As time progresses, the older age groups will become more and more familiar with computers and mobile devices, but to accommodate everyone now and in the future, the user interface of our application is very simple. Text is easy to read, and most importantly a new user should have little problems utilizing the full potential of the system. For the completely technophobic, it can be nearly autonomous, requiring the user to simply wear the sensors and then visit the doctor when collection is complete. However, it will also cater to the other end of the spectrum by being very customizable and revealing more options to more experienced users. Sensor Sensor Sensor Sensor Sensor data collection module e d o N Data preprocessing module Communication module ) e c i v e sea lie d Communication B bo module m , C P ( e n o h p l l e C Node Node Interpretation module Storage module Display & interaction module User Figure 2: Diagram of the software architecture. 3.6. Easy and noninvasive to setup and use A user will be expected to use the system every night in order to get an accurate assessment of her sleeping patterns. For this reason, the device must be easy to setup each night and must not interfere with a good night’s rest. Pervasive technologies make this especially easy, but present some challenges as well. The communication between devices is wireless, so the user does not need to worry about many