(NewsNation) — Wealthy biohacker Bryan Johnson, who's spending a fortune in hopes of significantly prolonging his lifespan, offers three simple tips that he uses to optimize his sleep.

The so-called longevity guru said he considers his resting heart rate before bed the most important biomarker that can help him achieve his long-term goal of living well past 100 years.

"I'll look at my heart rate and see how many times it's beating per minute. It is the best indicator of how I'm going to sleep and of my overall health," Johnson told Chris Cuomo during a televised town hall Tuesday about AI that included the topic of wellness.

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The 48-year-old Johnson offered three examples of things he does to control the key metric: He stops eating four hours before bedtime; turns off his electronic screens 30 minutes to 60 minutes before turning in; and refrains from caffeine after noon.

"These really basic practices dramatically lower my heart rate, they improve my sleep, which then improves my willpower, allows me to eat better and exercise," Johnson said. "So, really simple, basic things have a dramatic ability to improve your health and wellness."

A resting heart rate of 60 to 100 beats per minute is considered normal, although athletes can have resting heart rates that are closer to 40 beats per minute, according to the Mayo Clinic.

Johnson, who made his fortune through digital payment companies, has become known for trying to reduce his biological age through strict diet, physical training and medical tracking. Media accounts characterize him as trying to live forever, but Johnson, in remarks Tuesday, emphasized the idea of pushing boundaries.

"Five years ago," he said, "I started on this quest with the basic question: Are we the first generation who won't die? Now, that does not mean immortality. It means, will we begin extending our lifespans to 80, 85, 90, 100, 120, 130? Then at some point we say, 'Huh, is it going to just keep on going?' What do we do?"

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