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Had a very fast heart rate (up to 120 bpm) during my sleep last night. Should I be concerned? : r/AppleWatch
![Dynamics of Heart Rate and Sleep Stages in Normals and Patients with Sleep Apnea | Neuropsychopharmacology Dynamics of Heart Rate and Sleep Stages in Normals and Patients with Sleep Apnea | Neuropsychopharmacology](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fsj.npp.1300146/MediaObjects/41386_2003_Article_BF1300146_Fig1_HTML.gif)