Brief Answer:
Stretching of muscles can prevent cramps

Detailed Answer:
Hi
Thanks for posting
The Cramps are caused by hyper excitability of the nerves that stimulate the muscles. Cramps at rest are very common, especially in older adults, but may be experienced at any age, including childhood. Rest cramps often occur during the night. While not life threatening, night cramps (commonly known as nocturnal cramps) can be painful, disruptive of sleep, and they can recur frequently (that is, many times a night, and/or many nights each week). The actual cause of night cramps is unknown. Sometimes, such cramps are initiated by making a movement that shortens the muscle. An example is pointing the toe down while laying in bed, which shortens the calf muscle, a common site of muscle cramps.
A simple way to prevent night cramp is stretch your calf muscle before going to bed 3-4 times and each time holding for 10-15 seconds. Quinine water tonic is also useful to prevent night cramps before going to bed. The other useful prescription only drug is baclofen.

I hope this information will be helpful to prevent night cramps. If you have further query I shall be glad to answer.
Take care

---