Need help urgently with blood pressure.

Hi I was in the hospital 2 days ago and when having my vitals measured my blood pressure came in at 136/80 but resting heart rate only 52.

I thought resting heart rate being low meant blood pressure would be and also I'm lean at the moment so what could be causing my issue.

I had slept 4 hours the night before could that theoretically cause a big spike in blood pressure. Also could caffeine use be putting it up (although i would of thought that would put heart rate up)