Despite trying to go bed early I just can't seem to doze off. I would often buy one-time use heated eye masks from the pharmacy to remedy my insomnia until I discovered this product. Simple to use - set the heat level and adjust the time duration. I check my Fitbit every morning (which grades my sleep quality and cycle) and I can testify since using the USB version it's improved my sleeping pattern. Also the aroma scent is a nice touch.