Increase in heart beat while sleeping may be due to gas in stomach which presses the heart in lying position, May be to some Anxity or tension, and also may be due to heart issues
Please follow the following
Eat light food in night
Drink water after 1- 2 hours after night food
Walk for about 10 minutes after food
Sleep after 2 hours after taking dinner
Measure BP
Next Steps
Please connect for further advise on practo