Use water temperature between 102 to 106 degree F for loosening tight, tense muscles and reducing the pain of stress-related conditions such as backache. Take a cold shower after you step out of the bath. This brings and immediate rush of blood through your system, as well as a rush of energy. Stay in the bath no more than 15 to 20 minutes. If you have high blood pressure or cardiovascular problems, don't stay long enough to raise your body temperature.
Evening is the best time to soak in water.
A study conducted in England found that people who took a soaking bath before going to bed slept more readily and deeply.