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Sleep is one of the most fundamental and basic things humans do. Without it, we'd literally die.

But many find it extremely challenging to not only get an adequate and consistent amount of sleep every night, but to do it well.

We turned to an expert — sleep scientist Patrick Fuller, an associate professor of neurology at Harvard Medical School — to get some answers.

He gave us the lowdown on what he does to ensure a good night's sleep every single night.

While this routine works for Fuller, it may not be feasible for everyone's lifestyle and schedule. But Fuller says that deviating from this schedule leaves him incredibly unhappy and tired.

Here are seven things he does to ensure a restful sleep every single night.

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