Especially when you are half asleep and half awake, not all organs of the human body are asleep at this time, and some organs such as legs may still be moving.

But if you feel pain when you tremble involuntarily, it should be a cramp.

The main causes of cramps are:

1. Poor local circulation, peripheral vascular disease or varicose veins.

2. The ambient temperature changes suddenly.

3. Emotional stress.

4.

5. The content of minerals (such as magnesium and calcium) in the diet is insufficient.

6. The incidence of some chronic diseases and cramps in pregnant women will also increase.

7.

8. Motor neuron disease, spinal radiculopathy or peripheral neuropathy.

9. Some antihypertensive drugs and hypolipidemic drugs may also cause leg cramps.

10. Unknown reason.

How to reduce the chance of cramps;

1. Pay attention to calcium supplementation: in adolescence, calcium will be relatively deficient, which is more likely to cause cramps.

2. People who are prone to cramps when sleeping at night should do stretching exercises in the cramped parts before going to bed.

3. Keep warm when sleeping.