Sometimes my resting heart rate is at 85 or 90 and other times as low as 65 is that normal for it to fluxuate like that? Different days. Also sometimes it seems to be beating faster in the morning when when I get up, or if I get up in the middle of the night(but that happens more so during PMS.) but sometimes at night it is low like 65 or sometimes 75 and sometimes 95.