Why isn't it easy to ball our fist after a deep sleep ?

Or, "Why is it difficult to..."

Clenching your fist seems easy for almost people.

But have ever you effortfullly tried to ball your fist after waking up ?

It's not because you lose your strength, that i. It's a perfectly natural phenomenon, but that's not an universal thing so not all everyone's, so you may not have experienced it.

More conversational/inviting tone.

To contract or relax, muscles need two basic components: The nerve impulse and the electrolytes.

Electrolyte iss are a mineral that carries electronic charge when dissolvesd in the liquid and there are s. Some common electrolytes that can be found in the human body such asinclude: Ccalcium, Ppotassium, Ssodium, ectc.

Calcium, sodium etc are not proper nouns in English so they are not generally capitalised.

When muscles receive a signal from the nervous system, they change the electrolyte's' concentration depending on what signal is: ¶
To contract, Ssodium and Ccalcium get intoenter the muscle and Ppotassium leaks out ¶
To relax, the muscle just only needs Ppotassium inside.

That's also explain why the deficiency of Potassiumwhy the potassium deficiencies usually causes muscle cramps.

To understand why this strange bodily phenomenon occurs, it relateswe must look to our heart.

The way you worded it doesn't quite sound natural, so I took a different wording you used above that sounds better.

We all know that the heart controls the bloodstream to deliver oxygen, nutritions, and also electrolytes to entirthe body.

It's activities change relydepending on the status of the body.

Look up "It's vs. Its", it is a confusing rule of the English language that often confuses native speakers and learners alike.

When we are in a deep sleep, allmost parts of the body turn on the "repair mode excep". But some vital organs like the heart continue to work, t. The heart will decreases the amount of blood pumped to parts like arm and leg to save body'sconserve energy.

And after waking up, especially when we are awakened suddenly due to the(such as by a pet or the alarm's sound), the muscles in our arm are not provided enough amount of electrolytes to work and causing the above phenomenondon't have enough electrolytes to work, leading to the phenomenon described above.

Though this strange phenomenon is normal, it's also considered as dangerous medical symptoms relate toa possible symptom of some diseases like, such as Carpal Tunnel Syndrome – (CTS) or Rheumatoid Arthritis.

Therefore, in casf you experience this phenomenon occurs usualregularly, you should check it out at the hospitalget examined by a doctor as soon as possible.

Typically, this would be an outpatient service in most English speaking countries - not at the hospital.