Coffee might feel like the Elixir of Life when you’re sleep-deprived, but research says that eventually the magic fades, and you really should just hit the sack, reports Ozy.
The findings further underscore that “sleep debt is real,” says Tracy Doty, the research scientist at Walter Reed Army Institute of Research who led the study. “Every night you’re not sleeping, you’re building up increased sleep debt, and the same amount of caffeine is no longer effective.”
