Here is an eye pillow that lets you get some shut-eye anywhere. The OstrichPillow Loop adapts to your head and face and blocks 99.9% of light. You can easily wear it around your neck when you are done napping.
The Ostrich Pillow Loop has a microbeads core and discreet hook & loop fastener. Expected to ship for as low as $20 (if you are an early supporter).