The Economic Times

Study finds left-side sleepers report more nightmares, while right-side sleepers enjoy calmer sleep

A 2004 study published in Sleep and Hypnosis found that sleeping on the left side is connected to more nightmares, affecting around 41 percent of participants compared to 14.6 percent of right-side sleepers. The study analyzed 63 people, asking them to sleep on either side and then report dream experiences. Interestingly, left-side sleepers reported generally better sleep overall despite more bad dreams. Right-side sleepers experienced fewer nightmares but lower-quality rest.