Two hours into a 14-hour flight from New York to Tokyo, your head drops forward for the 47th time. You jerk awake. Your neck hurts. The person next to you is somehow asleep against the window. You’re not. This is the travel pillow problem — most of them don’t work, and you’ve probably wasted $30 on one that sits in a drawer. I’ve spent the last six years flying long haul for work and for fun. I’ve tested 12 different neck pillows across 30+ flights over 8 hours. Here’s the short version: only 3 designs actually prevent that head-drop. The…