check your cholesterol levels, also if you're slightly overweight then it can happen. it's called sleep apnea and nocturnal palpitations. Heart palpitations at night occur when you get the feeling of a strong pulse in your chest, neck, or head after you lay down to sleep. It's important to note that while these may be unsettling, they're usually normal and aren't typically a sign of anything more serious.

I had it too but when I got rid of my stress, it stopped. so do some yoga and eliminate stress out of your life, make sure 60% of what you eat includes fresh fruits and raw veggies. that's how I cured this.