Really weird leg cramp attacks at night

[Hey_Porter]

So for about three years now every, I don't know, once a month or so, I wake up in the middle of the night with a leg cramp that hurts like hell (it's the pain that wakes me up). It's like my entire leg muscle gets as tight as it possibly can and feels like it's going to pop out of my leg. It usually only lasts 30 seconds ago and subsides to the point that it's tight, but it isn't painful. Last night, though, it lasted a good two minutes (I really freaked my wife out shooting out of bed and grabbing my leg). Today, it's still kind of cramped up. Anyone ever have anything similar, or know what the hell this is?