Most yoga classes end with a meditation period that lasts for several minutes; here, your body should be totally neutral and relaxed so that your mind does not have to focus on any one body part.
Lie on your back on the mat, arms at your sides with palms up. Try to soften every muscle in your body, so that your feet fall naturally to the sides. If your head is uncomfortable in this position, you can support the back of your neck with a folded blanket. Make sure your shoulder blades are resting equally on the floor. Pay attention to where you might be holding tension -- in your jaw, forehead, chest -- and release it. Stay here for about five minutes, focusing on your gentle breathing. To come out of Savasana, roll onto one side and slowly push yourself up to sitting, bringing your head up last.