Yes, as long as you have the nozzle of the receptacle pointed downward so urine can freely ﬂow into the bag and the volume that may be ﬁlled during your nap will not exceed the remaining capacity of the urine bag. Keep in mind that: The Afex system is gravity based, so make sure to keep a slight incline when lying down; The urine bag volume is reduced when not in a standing position. For best results, the urine bag should be emptied often to ensure there is space for urine to pass into the bag. Too much urine in the bag may prohibit the one-way ﬂapper valve to properly open to let additional urine into the bag. Important Notice: When using the day system do not recline in your recliner chair, legs must be below pelvis to prevent leakage.