I tracked my sleep for 30 days. Not just hours. Quality. Deep sleep percentage. REM cycles. Wake events. My watch gave me a "sleep score" every morning. And at the end of the month, I went to my doctor and asked her to check my blood pressure. It was up 12 points. Systolic. From 118 to 130. Pre-hypertension territory. Coincidence? The research says no.
Chronic sleep deprivation β less than 7 hours a night for adults β is linked to elevated blood pressure, increased cortisol, impaired glucose metabolism, and higher cardiovascular risk. I was averaging 6.2 hours. Not because I wanted to. Because I have a toddler, a job, and a life that doesn't fit neatly into an 8-hour sleep window.
The 12-point jump scared me. I'm 38. I exercise. I eat reasonably well. But I was slowly damaging my cardiovascular system one short night at a time. And I didn't even feel that tired. That's the insidious part of sleep debt. You adapt. You normalize. You think you're fine until a blood pressure cuff tells you otherwise.
I made changes. Hard ones. I started going to bed at 10 PM instead of 11:30. I stopped scrolling my phone in bed. I accepted that the dishes can wait until morning. My sleep average went to 7.1 hours. After six weeks, my blood pressure dropped to 124. Not perfect, but moving in the right direction.
Sleep isn't a luxury. It's maintenance. Your brain clears waste during deep sleep. Your body repairs tissue during REM. Your blood pressure drops naturally during the night. Skip it, and you're skipping maintenance. Eventually, something breaks.
Track your sleep. Not to obsess, but to know. And if your numbers are low, fix it. Your heart will thank you. Eventually.
I also started tracking my sleep environment. Temperature, noise, light. I discovered my bedroom was 74 degrees at night β too warm for optimal sleep. The ideal is 65-68 degrees. I adjusted the thermostat. I added a white noise machine to block out the neighbor's dog. I put my phone in another room so I wouldn't scroll at midnight. Each change was small. Together, they added 45 minutes to my sleep time.
My doctor was pleased with the blood pressure improvement but wanted me to aim for 7.5 hours. "The sweet spot for cardiovascular health is 7-8 hours," she said. "Less than 6 is dangerous. More than 9 can also be problematic." I asked about naps. She said a 20-minute power nap is fine, but long naps can disrupt nighttime sleep architecture. So I stopped the weekend 2-hour naps. I miss them. But I don't miss the 2 AM insomnia that followed.
I also learned that sleep debt is cumulative but not perfectly repayable. You can't sleep 4 hours all week and then "catch up" with 12 hours on Saturday. The damage from chronic short sleep is done day by day. The best strategy is consistency β same bedtime, same wake time, every day. Even weekends. Especially weekends. Your circadian rhythm doesn't know it's Saturday.
β Dr. Lisa Park
