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REM sleep is closely associated with cognition and emotions (not to mention vivid dreams). Meanwhile, deep sleep is crucial for immune function, physical restoration, and general well-being.

What is deep sleep? "Deep sleep is also known as slow-wave sleep and is the third and deepest stage of non-REM sleep," says Dr. William Lu, Dreem Health Medical Director and sleep medicine physician.

Two new studies suggest once again the importance of getting a good night's sleep for good health over a lifetime, as scientists pursue new understandings of restorative deep sleep.

According to the energy conservation theory, we need sleep to conserve energy. Sleeping allows us to reduce our caloric needs by spending part of our time functioning at a lower metabolism.