It's a sign of potassium deficiency. Take extra potassium or each foods high in potassium, like bananas, sweet potatoes, tomato sauces, etc. You can google a complete list.
Getting them when your sleeping is the worst I seriously woke up screaming, it so uncomfortable. Atleast I know it's normal now though lol.
Lol I would get them if I'd actually strech out my legs lol but I keep from doing that.
Omg yes! I get them a lot when I'm sleeping and it hurts!