If you find you have a good hour or more during your day, go home take a hot bath with lilac or lilly bath beads, light some candles and maybe read a good book. Hiding in your car or office for twenty minutes with no interruptions can give you a whole new outlook on your day. Music is a wonderful relaxation method, nature tapes are great to put your mind at ease. The human body needs only twenty minutes of relaxation a day to rejuvinate, and music can fill those twenty minutes with bliss. If you want more of a physical and mental relaxation time try yoga or any other meditation technique.
Yoga is most successful, especially in a short period of time.
If classes are not your style, your local library has plenty of relaxation books on yoga to suit your needs. Give yourself a nice mini facial. You can use over the counter exfoliant. This will help take all those stressful toxins from the day off your face, relaxing your facial muscles. Use a light toner and moisturizer before bed, also take a minute to rub some lotion on your feet and hands.