From past few days i've noticed that my legs and hands even sometimes fingers, toe jerk or twitch involuntary on their own... I have earlier noticed jerks and twitches when i am falling asleep but this thing that i am experiencing now is completely new as it happens when i am awake  sitting on a chair or lying on bed and has made me worry...Although it doesn't happen all the time but has been frequent from past 3-4 days What should i do??? Please advise.