Some people simply prefer an elevated sleeping position, while others have reflux, nasal congestion, pregnancy-related discomfort, or musculoskeletal problems.

A new change accompanied by breathlessness deserves medical evaluation.

3. A Racing, Pounding, or Irregular Heartbeat

Have you ever been lying quietly in bed and suddenly become aware of your heartbeat?

You might feel:

Racing

Pounding

Fluttering

Skipped beats

An irregular rhythm

These sensations are called palpitations.

Palpitations can occur for completely benign reasons, including caffeine, stress, dehydration, lack of sleep, or anxiety.

However, they can also occur with abnormal heart rhythms, including atrial fibrillation and other arrhythmias.

If palpitations repeatedly wake you from sleep, last for an extended period, or occur together with dizziness, fainting, chest discomfort, or shortness of breath, they should be evaluated promptly.

4. Chest Pressure or Discomfort

Chest discomfort is one symptom that should never be casually dismissed.

Heart-related discomfort isn't always described as a dramatic stabbing pain.

Some people describe:

• Pressure
• Tightness
• Heaviness
• Squeezing
• Burning
• A feeling that something is sitting on the chest

Pain or discomfort can sometimes spread to the arm, shoulder, back, neck, jaw, or upper abdomen.