Idiopathic cramps!

Don't worry, its not THOSE kind of cramps. They're in my legs whilst I'm sleeping!

I'm a little slow on the uptake, but I've finally looked up why the hell I keep getting woken up my my calve muscles cramping. They woke me up again last night and now I'm limping funny because my calf is still not all the way relaxed. This is the second bloody time this week and they always wake me up, it hurts so fucking much.
No one has any idea why this shit happens, it could be multiple things. There's also nothing you can do to stop it really, it's more a 'suck it up and bear it' type thing which is rather annoying considering most people say they go away, mine hangs around the whole of the next day.

Ultimate-bloody-leg-cramp!

So here are the possible reasons why this occurs;

Some drugs can cause cramps as a side-effect, or make cramps occur more often. These include: diuretics ('water tablets'), nifedipine, cimetidine, salbutamol, statins, terbutaline, lithium, clofibrate, penicillamine, phenothiazines, and nicotinic acid. - Well that's not it, not on anything.

Over-exertion of muscles  -haha, definitely not exerting myself.

Dehydration - I drink 2 bottles of water a day.

Conditions that cause alterations in the balance of salts in the bloodstream (such as a high or low sodium or potassium level). - I had maccas for dinner last night? High sodium intake, possibility, but doesn't explain the one at the start of the week.

Some people who have renal (kidney) dialysis get leg cramps - I'm not yellow so that's a no.

Pregnancy - usually in the later stages - immaculate conception exception, nope.

An un-treated under-active thyroid gland - gosh i hope not.

Peripheral vascular disease (narrowing of the leg arteries which causes poor circulation) - that ones doesn't sounds good but not likely.

Excess alcohol - I wish!

Some uncommon disorders of nerves - I don't like the idea of that.

Rare causes include: cirrhosis of the liver; lead poisoning; sarcoidosis - O_0 Holy hell, please not that!

Now, these are all a vague yet small possibility, then I found this;

In most cases the cause is not known. One theory is that cramps occur when a muscle that is already in a shortened position is stimulated to contract. As the muscle is already shortened, to contract further may cause the muscle to go into spasm. This commonly happens at night in bed as the natural position we lie in is with the knees slightly bent (flexed), and with feet pointing slightly downwards. In this position the calf muscle is relatively shortened and may be prone to cramps. This theory explains why stretching exercises may cure the problem.

DING-DING-DING, we have a winner!

So, not to self - don't tuck in your sheets or blankets and try not to point your toes whilst sleeping. How the hell do I stop myself doing that while I sleep!!!