All of sudden 1 week back I was sleeping and I woke up because I felt my whole bed was shaking but when I sat to hold the bed there was no Earthquake. And I went back to sleep and felt again . Since that day when ever I sleep I'm having this Earthquake feeling. And I feel my legs are weak i feel minute twitches or not painful small muscle spasms. And with this I felt like my heart is not beating fast but I can hear it loud with its movement. Pulse rate is normal . I'm preparing for exam. I don't even do normal walking I just sit and study . Any blood test required like iron? Or is it psychiatry issue ? Or do I really have heart or nerve problem ?