pingu, don't be too alarmed, the occasional leg cramp at night is perfectly normal. I can happen to people of all ages, even children. Have a look at this web site. It will answer all your questions.
I wouldn't worry at all - I expect it will just be a one off. I remember a year or so ago waking up in the middle of the night with bad cramp in one of my calves. In the morning my leg really ached from it. I havn't ever had it since though, it was just one of those things.
As RATTER says smoking could be a cause, as I don't think age has anything to do with it pingu. My husband once fell out of bed with the pain, rolling about on the floor - and he was only about 26 at the time.
I'm ashamed to say I couldn't stop laughing at his contortions!
Hey i am 21 and i get this, i have stages where i will get it like 4 nights in a row and then it stops. Id wake up and stretch my leg and it would completely lock up and i would be in agony and have to lie there unable to move for a few seconds until the muscle loosens and the pain stops. I actually posted this on here a while ago. They say eating bananas helps and they contain pottasium which helps prevent cramps
A small glass of tonic water works wonders.Contains Quinine which dampens down cramp but needs to be taken before going to bed if the cramps become frequent.If your cramp was a one-off then it will not help.
It can also be caused by the lack of calcium. My dad used to get cramp & he used to get reilief by standing on a cold floor. With all the central heating now, this may be diffucult. You could fill a bottle up with ice cold water & roll your feet on it. Does the trick.
The best advice I was given is to immediately lift up your toes as high as you can .Using just your muscles (i.e. not physically lift toes with hand) .Easy to show hard to explain! I think it pulls your muscle the other way so it doesn't tense or lock. It works almost instantly .One of the best pieces of information I have ever been given.