CNN —

Dr. Diego Ramonfaur is often sleep-deprived.

In his third year of an internal medicine residency at the Cleveland Clinic in Ohio, Ramonfaur faces schedule changes every one or two weeks. With workloads that vary depending on the rotation, going to sleep and waking up at a consistent time is impossible.

So Ramonfaur, 30, turned to sleep banking — a strategy of getting extra sleep that some people use before a time when they know they'll be sleep-deprived.

Video above: The benefits of quality sleep during marathon training

When Ramonfaur's shifts are lighter but he knows longer rotations are coming, he will often try go to bed earlier to "gain a little bit of ground," he said. "Investing in sleep, even before I am tired, has been very rewarding in improving my performance during t

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