I have labile hypertension so my BP readings are whack. It is usually up at 160/100 at the doctors office but at home it is normal. Docs did not believe me and were trying to force me onto meds till they put a 24 hour monitor on me. BP spikes and drops during the day and drops to 100/60 at night.
Labile hypertension is the most difficult to treat. So far my heart is perfect for a late 50's dude. Just had an colorflow echocardiogram, no sign of hypertension in the heart. Probably because I eat so much fish.
If I drink coffee my BP is up all day though. I am just very sensitive.