The COVID-19 pandemic has made even sleep feel stressful. From vivid dreams and nightmares to increased levels of insomnia, many people are struggling with sleep right now.

This makes sense, because "we are wired to stay awake in the face of danger," Jennifer Martin, clinical psychologist and member of the American Academy of Sleep Medicine, and professor of medicine at the David Geffen School of Medicine at UCLA, tells CNBC Make It. "In that way, it's normal to have struggles with sleep throughout all kinds of difficult situations."