Sleeping on the left side may increase nightmares because body position can influence breathing, heart activity, and brain function during rapid eye movement sleep Scientists believe this may affect emotions and dream intensity However nightmares are more strongly linked to stress, anxiety, trauma, and poor sleep quality than sleeping position alone Research by Calleja and colleagues found higher nightmare reports among left side sleepers compared with right side sleepers Source: Calleja, N., et al. “Relationship Between Sleep Position and Dream Emotions.” Sleep and Hypnosis, vol. 4, no. 4, 2002, pp. 191 to 195. Want more interesting content like this ? Follow gravitonomy :) #nightmares #science #sleep #neuroscience