Could be caffeine: If you are drinking too much caffeine, you are likely to experience a racing heart especially,when lying down at bed time. This could also be a result of anxiety. I would wonder why you are consuming,the amount of caffeine that you are drinking? Are you sluggish or finding it hard to concentrate and focus. Likewise, why are you taking the vitamin D? Talk to your doctor about these questions.
Answered 12/19/2019
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