morning calf cramps

Now here is where dehydration and lack of electrolytes HAS actually been shown to cause cramping.

I would recommend making sure you have had enough to drink before going to bed and also to make sure you are eating a well rounded diet that includes enough salt, potassium, calcium and magnesium.  Try that out first and see if it remedies the situation.

I got them a lot during Basic Training in the Army and I had to stretch and actively rub down the calves (both some nights) to get it better.  I would then try and pay a lot of attention to what I took in and that would help.

x2

The first thing I do when I wake up is flex my feet and give my calf and hamstring a good stretch.  Seems to keep the cramps away.  I haven't had any since I started doing this, and it's one more good stretch to add in the day (since I sorely lack in stretching!)

When I start having cramping issues, what Rick mentions is exactly the culprit.  Good news is it's an easy fix.

x3 

Would have to agree with this. I used to get this way back when I used to have ahem ... inactive lifestyle. Bad eating habits etc. 

After I started watching my nutrition and getting active and hence getting a lot more balance into my diet, never had it. So would have to agree with the above reasoning .

With me, it's always, always, always:

1. Potassium
2. Magnesium
3. Hydration

Supplementing these 3 never fails to fix the problem.

If I ever miss my supplements or fail to hydrate properly, I pay with calf cramps that keep me up from about 12am-6am.

Best of luck!