Electroencephalogram (EEG) sensors will be placed on your scalp and face in order to measure what 'stage' of sleep you are in. Electrocardiogram (ECG) sensors will be placed on your chest to monitor your heartbeat. A small probe will rest just inside your nostrils in order to measure your breathing and airflow. A snoring sensor will be taped on your neck. Elastic straps will be placed around your chest and abdomen (midsection), which will measure your breathing effort. Sensors will be placed on both of your shins in order to measure your leg movements. A sensor will be taped onto your fingertip in order to measure your blood oxygen levels.