What might be the cause of random Finger Twitching?

Wow thank you so much for all this information! That tip about correcting posture is super helpful. I'm going to research all the options (and make a diagram) you listed and follow up with my neurologist about potential nerve entrapment or compression. I'll also check out the link you connected. Thank you so much!

@gigiraj you're welcome. I always have to work on my posture too. What helps me is building core strength because it supports everything else. I have a horse, and riding helps me a lot with that, and according to my surgeon maintaining core strength is the best way to support the spine to prevent future problems. I've had the nerve conduction testing too. It was kind of painful and I was glad when it was over. You can still do physical therapy even if the tests do not find a specific problem. Yoga stretching might be helpful too. When you hold a pose and wait, it does release the fascia if you wait long enough. I do a lot of stretching of the front of my chest by laying on a foam roller. It tends to get tight because everything we do has our arms forward. You can also lay on the floor on your back in a T position. Doing that on a foam roller allows the weight of your arms to stretch backward opening up the chest.

I have the same tremors in my thumb and pointer finger. It was diagnosed as Essential Tremor. The difference between E.T. and Parkinson’s tremor is usually whether the tremors are noticeable at rest or in action. A Parkinson’s hand tremor is usually at rest, and an Essential Tremor is an action or postural tremor. I first noticed it when holding a small jar upright to apply makeup, or holding a newspaper up, or trying to thread a needle. I take Propranolol for it an it does help. It can progress over time, but usually at a small, slow rate. Stress, fatigue, extreme temperatures, and caffeine make it more noticeable. I hope you get the help you need.

My Dystonia started out with essential tremors and finger twitching. As a kid, I was always dizzy, nervous, hyperactive, light sensitive, and my brain was in a heavy fog. My cognitive abilities were effected. I could not function properly and took jobs that did not take much brain power. My brain was not working properly. I was so sick! Doctors said I just needed SEX, yes SEX! HUH? Then I developed Spasmodic Torticollis that effects sufferers in mid-life. Look into a movement disorder neurologist who knows about Dystonia. A well-seasoned neurologist, and not somebody right out of medical school. Many are still perplexed about Dystonia and do not care to hear our stories. Excuse me, you learn from your patients. I being a RN, with this monster, teach movement disorder neurologists. I give them magazines and they end up throwing them into the trash cans. I end up leaving them in the dust. I've attended nation-wide support groups, started my own support group, been on TV and in the newspaper. I know this monster and how it effects your brain and body movements. It's nearly ruined me.

My finger suddenly started moving involuntarily while dosing off to sleep. I would be almost asleep then I felt movement like my second pointer finger jumped for no reason. The movement has gone to my arm and head. I will be a sleep and all of sudden my head tries to fly off my neck. I have not said to much about it because it does not hurt. I just get a big surprise when it happens. I can't recall every problem because it is to much. I have been blessed even though it has been hard. Depression. anxiety, loneliness and family has been hard for me. Sorry I get carried away.

Has your doctor commented at all on this involuntary movement of your finger when you drop off to sleep @tigerlilly? Will you talk more about the movement going to your arm and head and feeling as though your head is trying to fly off your neck?

Updates! I've started developing parasthesia as I'm lying down to sleep! Super fun stuff! I'm totally not terrified!! More seriously, I've always been able to sleep when my head hits the pillow but now I'm awake for an hour or so because the parasthesia keeps my BOTH arms burning and feeling numb. I'm also kept awake because of the intensity of the internal vibrations, which used to happen only when I was tired or gassy--and even then I'd be able to sleep instantly. There will be times when the tremor in my hands is visible, in both my dominant and non-dominant hand. All in the space of two days!

@tigerlilly I've experienced something similar (tho not as extreme and only in my arm) when my arm will feel like it's about to seize and will jerk me awake. I've managed to schedule an appointment on August 20th after my MRI with the neurologist so that he can identify any nerve conduction tests/EMG/etc. Will update after that.

Thank you I have not told anyone except a doctor .

That's how mine started off. First my finger and then hand tremors but graduated to Spasmodic Torticollis. Usually at night, my neck was better. I had surgery, so I am 90% better. I was desperate, something had to be done! Mine is 100% GENETIC! Having it on both sides of my Mom's family has made me severely sick all of my life since a wee kid. I have truly suffered from this disease which made me do things I would never do if I was normal. Dated bad destructive men, taken jobs that required little brain power, and people noted I had problems. Embarrassed and worried that I may lose my job, I responded that I was okay, but I knew something was going on that I had no control. Back in the 1970s, nobody knew what I was talking about. I have suffered from this monster. This was back in the day when you took pride in your job, no matter how low your job was....

@gigiraj I've had these symptoms too, and my arm going entirely numb while I was sleeping on my side, and it was not the arm I was laying on. That was the first symptoms I noticed of Thoracic Outlet Syndrome which is a compression of the nerves and vessels that pass between the collar bone and rib cage as they go to the arm. When we sleep, often our arms are in a "raised" position which causes compression on an already tight area. It causes tinging, arm pain and feeling like I have tight rubber bands around my arms. My hands used to turn blue and cold. I am in physical therapy for this and have had the most success with myofascial release (MFR). Some of the tests for TOS involve listening to the pulse in the neck and raising the arm while turning the head, and the pulse stops. Mayo did doppler tests and also measured blood pressure changes in my fingers with tiny finger blood pressure cuffs. Posture is very important for TOS, and sleeping on your back can prevent arm pain because it helps keep the shoulders back. It gets to be like wearing a straight jacket when your neck and shoulders are tight. Neurologists can diagnose this. There is surgery for TOS, but it can cause scar tissue that makes a patient worse, and my doctor advised against it for me. Here is some information on TOS and our discussion with lots of information about MFR therapy.
https://www.mayoclinic.org/diseases-conditions/thoracic-outlet-syndrome/symptoms-causes/syc-20353988
https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/
https://www.painscience.com/articles/respiration-connection.php
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3501918/
https://www.hindawi.com/journals/scientifica/2014/248163/
https://trainingandrehabilitation.com/how-truly-treat-thoracic-outlet-syndrome/
http://www.med.umich.edu/1libr/CVC/997ThoracicOutletSyndrome.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4129179/