advertisement Finding the “right” pillow is my white whale. I’m a side sleeper, tend to toss and tense up, and have mind-numbing, days-long migraines if I sleep in the wrong position, even for an hour or two. My doctor has chalked it up to a mix of poor posture and a bad sleep schedule. The threat of physical therapy led me on the search for a better pillow (and work habits), and nothing has come close to the Harmony pillow from Purple. advertisement Yes, Purple, the mattress company that sells those lavender polymer honeycomb-gridded beds. Its luxury pillow line—featuring the $159 Harmony Pillow—is available in three heights, with 1-inch differences between them, to accommodate different frames and sleep positions. I chose the Medium, which keeps my neck supported and squarely horizontal when sleeping on my side.