Give your kid a pet pillow. This is perfect for a nap in the car, plane or at home. The pillows I found are adorable in my opinion. I am absolutely sure your kid would love to have a friendly cushion and toy at the same time. The pillows are hand-crafted and the materials quality is one of the best.
The pillows are funny too coming in different shapes and materials. They are machine washable in case your kid loves them too much. You can check other details about the kids cushions here.