The biotech CEO trying to reverse aging has removed all but 3 things from his bedroom

• Bryan Johnson is trying to reverse aging with a project that costs up to $2 million a year.
• A Time Magazine profile reported the biotech CEO's bedroom was almost completely empty.

The biotech CEO Bryan Johnson — you may know him as the tech entrepreneur spending millions each year on far-out longevity treatments — spends his nights in a bedroom that's almost completely empty, with only three exceptions.

The only objects in his bedroom are his bed, a laser face shield — for reducing wrinkles — and a device to attach to his genitals to measure his nighttime erections, Time Magazine reported Wednesday in a profile of Johnson. He told Time that nighttime erections act as a marker for biological age.

"I only sleep in here. No work, no reading," Johnson told Time's Charlotte Alter.

For context about his nighttime routine, the biotech CEO has said gets in bed by 8.30 p.m. and starts the day before 6 a.m. In a video published on his YouTube channel in May, he said his evening routine involved using CeraVe products and hanging out with his son before bed.

The rest of Johnson's house apparently isn't quite as sparse as his bedroom. It includes a home gym with floor-to-ceiling wallpaper depicting a forest, bookshelves full of biographies — including ones on Napoleon and Ben Franklin — and an infrared-therapy lamp Johnson uses to mimic sun exposure, Time reported.

Johnson's experimental bid to turn his 46-year-old body into that of an 18-year-old doesn't just involve a peculiar sleeping arrangement, however. His routine for optimizing his health, Project Blueprint, costs up to $2 million a year.

He's said his routine involves taking more than 100 pills daily, wearing a cap to project red light into his scalp, a strict diet, high-intensity exercise, and aggressively measuring his body's age — through means such as blood tests, ultrasounds, MRIs, and colonoscopies.

Johnson's approach to reverse aging has drawn significant controversy. Scientists told Insider in February that many aspects of his routine had unclear health benefits.

In July, Johnson said he was halting one controversial part of his routine — receiving blood-plasma transfusions from his teenage son — because he saw "no benefits" from it.

To be sure, Johnson isn't alone in his search for the secret to longevity.

An increasing number of the world's wealthiest entrepreneurs are investing their fortunes in expanding the human lifespan. These include Sam Altman — who invested $180 million in a biotech company aiming to "add 10 years to healthy human lifespan" — and Peter Thiel, who has given $3.5 million to a nonprofit to make "90 the new 50 by 2030."

Johnson did not immediately respond to a request for comment from Insider, sent outside regular business hours.