We live in a culture that quietly admires people who need very little sleep. The four-hour night is worn like a trophy. Rest is for the weak, or so the mythology goes.

This mythology is costing us dearly.

During sleep, the brain runs its maintenance cycle. It consolidates memories, clears metabolic waste, regulates emotions, and repairs cellular damage. Skimp on sleep and every system suffers — attention, creativity, immune function, emotional regulation, decision-making. One study found that 17 hours without sleep produces the same cognitive impairment as a blood alcohol level above the legal driving limit.

The most elite performers in the world — athletes, surgeons, musicians — are increasingly prioritizing sleep as a core part of their preparation. Roger Federer reportedly slept twelve hours a night during tournament season. LeBron James sleeps ten. These are not lazy people. These are people who understand that performance happens during the day but is built at night.

Most adults need between seven and nine hours. Most adults do not get it. And most adults have no idea how impaired they are, because chronic sleep deprivation also impairs your ability to notice that you’re impaired.

Go to bed earlier tonight. Not as a luxury. As a decision to take your own performance seriously.