It did spike at 2am, but as explained on news recently, the spike could have also been the device was programmed to check in once a day to make certain that it was communicating.
“A pacemaker not only has the ability to create a heartbeat, triggering a heart to beat, but it’s also a sophisticated monitor of the patient’s heart rhythm, and a pacemaker is programmed to check in once a day, just to check in with its communication device and then ultimately the app that monitors it once a day,” he explained.
MSN