Can coffee or a nap make up for sleep deprivation? A psychologist explains why there’s no substitute for shut-eye

There is no denying the importance of sleep. Everyone feels better after a good night of sleep, and lack of sleep can have profoundly negative effects on both the body and the brain. So what can be done to substitute for a lack of sleep? Put another way, how can you get less sleep and still perform at your peak?

As a psychologist who studies the ways in which sleep benefits memory, I’m also interested in how sleep deprivation harms memory and cognition. After some initial research on sleep deprivation and false confessions, my students at Michigan State University’s Sleep and Learning Lab and I wanted to see what interventions could reverse the negative effects of sleep deprivation.

We found a simple answer: There is no substitute for sleep.

Sleep deprivation impairs cognition

For many years, scientists have known that sleep deprivation reduces the ability to maintain attention. When asked to monitor a computer screen and press a button whenever a red dot appears – a pretty simple task – participants who are sleep deprived are much more likely to have lapses in attention. They don’t notice a bright red dot and fail to respond within a half-second. These lapses in attention are due to a buildup in pressure to sleep and are more common at points in the 24-hour circadian cycle when the body expects to be sleeping.

Sleep deprivation can seriously damage your body.

Research investigating the effect of sleep derivation on more complex types of thinking has shown somewhat mixed results. So my team and I sought to determine how keeping people awake for one night affected different types of thinking. We had participants perform various cognitive tasks in the evening before we randomly assigned them to either go home and sleep or stay awake all night in the laboratory. The participants who were permitted to sleep returned in the morning, and everyone completed the cognitive tasks again.

Along with impairments in attention, we also found that sleep deprivation led to more placekeeping errors. Placekeeping is a complex ability that involves following a series of steps in order without skipping or repeating any of them. This would be similar to following a recipe to bake a cake from memory. You wouldn’t want to forget to add eggs or accidentally add the salt twice.

Can caffeine replace sleep?

Next, we set out to test different ways to potentially make up for a lack of sleep. What would you do if you did not sleep enough last night? Many people would reach for a cup of coffee or an energy drink. One 2022 survey found that over 90% of the American adults sampled consume some form of caffeine daily. We wanted to see whether caffeine would help maintain attention and avoid placekeeping errors after sleep deprivation.

Interestingly, we found that caffeine improved the ability to pay attention in sleep-deprived participants so well that their performance was

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