I've written before about what I won't touch after 7 p.m . But what we do in the morning may be even more important. Those early hours of the day are when your heart is the busiest. It goes through a daily wake-up cycle: cortisol rises, blood pressure climbs, and heart rate variability drops as your system shifts from rest to "go mode." Research has shown that cardiovascular events tend to peak during the first few hours after waking. One often-cited analysis found a clear morning surge in