You might try a smart watch if you are able to. My own Galaxy 4 and 6 versions of the Samsung Galaxy smart watch can record sleep stages, blood pressure, oxygen saturation, pulse, and even detect atrial fibrillation.
Or, if you prefer to use a cuff: https://www.theemtspot.org/best-blood-pressure-monitor-for-small-arms/
I measure my BP first thing in the morning, before turning over a single time and getting out of bed (which is where the Galaxy watch is always handy because I wear it to track sleep). Just like your morning pulse rate is a good indication of heart health and your corporeal health overall (a pulse rate five or more beats above a running average might indicate a virus or over-exertion the previous day, maybe you have arthritis acting up or some other intrusive pain, or even a poor night's sleep), your just-awakened blood pressure is a veridical measure of your overall health. During the day, though, hormones and diet and obligations, worries, physical exertion, and any stimulants such as teas or coffee might put you in the 'caution' or 'watch' range. Then, you go see your family doctor and he'll raise an eyebrow and say you should be checking your BP daily and report back in a week because it looks high. I hope I'm being clear: taking a BP and pulse almost anywhere else but as you awaken is likely to be 'confounded,'* and probably misleading.
*In research, a 'confound' is any factor influencing the measurements you're interested in taking, but which you fail to take into consideration. https://www.scribbr.com/methodology/confounding-variables/