What Causes Recurring Palpitations?

yesterday while i was in sleep ,suddenly i got waked up by sudden increase of heart beat .It was instinct and also heart beat makes me to wake up . I was shocked since it is my first experience . Then i feel like walking in floor so i done walking for 15-30 min .I Tried to sleep again but i got the same raising heartrate when i try to sleep on bed. After 4 hours it got nornal as of now . F Y I , I had my beer before this happen . ( 10 PM - had beer , 1 pm had this sympton ) ..Can any one provide the exact reason and what is it mean to my heart health or to my body ? My age - 30 , weight 105 , no sugar . i am over weight as BMI . SRINATH . A