Wearable Pillow
It looks a little out-of-the-box, but if you've ever had the window seat and wished you could rest your head against the wall, this pillow-slash-eye-mask is the perfect, most comfortable way to do it. You can wear it on top of your head like a turban to rest your head against windows, walls, and poles, slip it over your eyes for an eye mask, or shimmy it down to your neck as a small infinity scarf. 

OstrichPillow Light, $45, OstrichPillow