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Same here. But I always associated it with stress.

I feel the same way but after wearing a heart rate monitor, it definitely detects a higher daily average heart rate so it can't be healthy.

Normal days: 50-55bpm

Low sleep days: 63-68bpm

I've noticed similar. I've woken up early, taken my pulse and notice it was a bit high and used that to decide to go back to sleep.

I've always feel like I get my best quality sleep when I go to bed extremely tired.

This could have to do with whether you're waking up in between versus in the middle of a sleep cycle. From what I understand, the former is preferable to the latter.