I'm not clear on your question. Does coffee effect your resting heart rate? Your resting heart rate should be checked before you get out of bed. I recommned laying the hr strap on you. Even fidgeting with it can elevate your resting heart rate. A quick jaunt to the bathroom will elevate it. coffee, absolutely. Probably mostly because you'll burn yourself trying to drink it lying in bed.
Yes, your ambient heart rate may be effected by coffee. If you are a heavy caffeine user, you may notice less of a change than someone who is not. Try writing down your heart rate during the day. Notice how many factors effect it. Your ambient heart rate is a great way to identify your stress level. Compare a normal day and a stressful day.