Thank you for the additional information,
It sounds like you have some type of nerve irritation. Nerve irritation is what causes the tingling and numbness and can often cause a burning type of pain in the hand as well.
One of the most common causes of tingling in the hand is carpal tunnel syndrome. This develops when the nerve that supplies the thumb, pointer and middle finger becomes irritated or compressed as it passes through a tunnel/band of tissue in the wrist. Usually, people have numbness mainly in these fingers, but some people describe tingling of the entire hand. It can also cause pain in the hand as well.
For many people, the symptoms are worse at night, as you are describing.
People at risk for the development of this syndrome include pregnant women (wrist swells during pregnancy) and people who work on computers/typewriters or do a lot of repetitive work with their hands. (writing...)
The nerve that supplies the hands/forearm can also be irritated anywhere along its course. It does not have to be the wrist, it can occur at the elbow or at the level of the neck.
A nerve conduction test/EMG test is performed in order to determine exactly where the problem is occuring. Your doctor may be able to tell by physical exam where the likely area is, but the EMG is the test of choice.
Until you can see your doctor for an exam and testing, you can try wearing a wrist splint that keeps your wrist in neutral position at night.
Also try taking an anti-inflammatory such as ibuprofen or aleve (as long as you do not have any contraindications).
The treatment depends on where the irritation is occuring. Steroid injections in the wrist and physical therapy are often the first steps if the splints do not work.
It does not sound to me like a muscle strain at all, to be honest.
Here is more information for you if you would like to read about it:
Let me know if you have any follow up questions and I will be happy to answer them for you,
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