As the labour becomes more intense, and your body releases endorphins, it becomes increasingly important to rest and relax between your contractions. You'd be surprised at the difference that 2- 4 minutes of dozing can make in giving your body time to rest and gather strength for the next contraction. Your support people may need to stop engaging you in conversation at this time, only talking when it is absolutely necessary, so as not to distract you. You will probably find it hard to keep your eyes open during this time anyway.
Identify where you normally hold your tension and stress. For many people it is typically in their shoulders, neck, jaw or hands. Let your partner / support people know, so that they can remind you to relax these areas after the contraction has gone. You may not be aware of the muscle tension in these areas while you are labouring and giving birth. A common complaint in the few days after the birth is "I have aches in muscles that I never knew I had!"
It can be beneficial to utilise a 'body check' exercise. This is where others can assist you to release any tension held in your body, by guiding you to physically relax. The 'body check' means checking for any tension, and reminding you to release your jaw, soften your hands, relax your face and shoulders. Letting your muscles flop. For example, if your shoulders are up around your ears, your support person may simply place their hand on your shoulders every now and then, saying words like "let go" to help remind you.