You can listen to this very relaxing audio whenever you feel stressed as well as right before going to bed. This relaxation technique is proven to activate your parasympathetic nervous system, the part of your nervous system that heals you and makes you relaxed and ready for sleep.
I recommend you also download it to your device and listen to it in bed, but you can also use it whenever you feel stressed.
To download, simply hover over the above link and right click. Then click "Save Link As" and save the file to your computer.