I recently slept overnight with an exercise style heart rate monitor on my arm. In the morning I found that my normal sleeping heart rate is around 50-60 bpm. However, for a short period of about 15 minutes, my heart rate jumped to 202 bpm. It was about 1 1/2 hours into my sleep. Is this a problem I should worry about? I wore the monitor the next night and there was no spike at all.
Hello, These changes in the heart rate could be related to REM sleeping phase. It is quite normal, as during this phase the heart rate and respiratory frequency increases.  In my opinion, there is no reason to worry about, as this is a physiological fluctuation in heart rate during sleep.  Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.