been doing it all day, just spasming/twitching away randomnly… wtf causes this? was funny to start with, now I’m getting miffed with it! 😡

MND, you be like Steven Hawking in a couple of weeks. Sell your bikes, quick!!

Lay off the caffiene for a bit?

Low potassium?
Try eating a banana or drinking some tonic water.

Parkinsons?

I get this occasionaly and only have one coffee per day and eat plenty of bananas, hasn’t happened for a while so not parkinsons.
It just comes and goes, no idea why…

I get it quite often inside my thigh – whatever muscle that is – when I’m in bed
No idea what causes it

Can be a sign of muscle failure. Have you been practicing the five knuckle shuffle a bit much?

http://en.wikipedia.org/wiki/Tetany_(medical_sign)

Possession. Is it your left arm?

fasciculations

Best case benign, worse case wot loddrik said.

Noticed any weakness in your limbs ? Fumbling buttons? Not quite able to tighten nuts by hand properly any more ? Any speech slurring (without beer) ? Or have you been coughing on your pringles.