Hello and hope you are doing well.
Awareness of your heartbeat is termed as palpitation and it can be due to hyperthyroidism( overactive thyroid), arrhythmias (altered electrical system of the heart), certain medications, heart failure, anemia and low blood sugar. It can be aggravated by exercise, fever, excessive alcohol consumption, smoking and dehydration. Anxiety, fear or stress can cause palpitations. You should consult your primary care physician for therapy. He will examine you and may ask for blood tests and an EKG.
Hope this helped and do keep us posted.
I have a similar problem. Heart rate increases about 90 mins into sleep. Several things can cause this,one being if you lie perfectly flat and you have a upper stomache herniation part of stomache slips up into esophagus and makes heart work harder. If you sit up it should subside. If not this, then try sleeping with upper half of boady elevated. When you lay flat or on side, blood or fluids can pool and make heart work harder, Heart is working faster because something is giving the command to it to supply more blood and or oxygen. I would do some research and self tests, Try lieing down in daytime, see if it happens, see if food related, if activity related and see if you drink water and stand up if it subsides. Your body will give you clues, listen to it and good luck!
i am tired ALL THE TIME!!! and even though i am on all these new mends...i feel more winded now than ever... i just had a preemie via c - section on jan. 12th