HOME FIRST AID: CRAMP.
Cramp is caused when there is a spasm in a muscle which can feel painful and unexpected.
You may experience it during or after exercise and as you get older you may find it more troublesome at night as you go off to sleep.
To relieve cramp, stretch and massage the muscles that are affected.
For example, if you suffer from cramp in the calf, sit down and straighten your leg and make sure your foot is fully supported too.
Try to flex your foot up and down to help stretch the calf muscles as this will help to ease any pain and the cramp.
Massage, done by yourself or someone who's with you, can often be effective, particularly if it's deep.
Pressure with two fingers or a thumb can be especially soothing.
I know this is an old-fashioned one, but drinking a glass of water with half a teaspoon of salt in it before going to bed can sometimes help to remedy any night cramps.