One of my Doctor friend has sent this tip,hope will be useful to all.

Why keep aspirin by your bedside? About Heart Attacks: There are other symptoms of an heart attack besides the pain on the left arm. One must also be aware of an intense pain on the chin, as well as nausea and lots of sweating, however these symptoms may also occur lessfrequently. 
Note: 
There may be NO pain in the chest during a heart attack.  
The majority of people, about 60%, who had a heart attack during their sleep, did not wakeHowever, if it occurs, the chest pain may wake you up from your deep sleep. 
 
If that happens, immediately dissolve two aspirins in your mouth and swallow them with a bit of water.  
Thereafter:   
CALL 911 
Say "heart attack!" 
Say that you have taken 2 aspirins. 

phone a neighbour or a family member who lives very close by. 
-  take a seat on a chair or sofa near the front door, and wait for their arrival and... 
~  DO NOT  lie down ~