So last night about two hours following a reasonably tough cycle I was sitting on the couch and got my first ever heart alert from my Apple Watch that my heart rate had spiked over 120 bpm while resting (spiked to 140).

I thought it was just a glitch and ignored it. About 45 mins later in bed I got another alert and then another after another 15 mins.

Is this type of thing reliable, or is it more likely just the watch getting a bogus reading? Kind of considering going to see a doc which I know is the safe bet but would be interested to hear if anyone else has experienced this?