There is a pillow called 'ostrich pillow' that enables power naps anywhere.

Ostrich pillow offers a micro environment in which to take a warm and comfortable power nap is at ease. It is neither a pillow, nor cushion, bed or garment but a bit of everything all at the same time. It's size is : 45L x 28W x 15H and circumference of opening for the head is 70 cm. It is made up of flexible fabric and filled with micro balls.  The ostrich pillow is washable as well. The ostrich pillow have a soothing cave like like interior shelters and it isolates both your head and hands. It is perfect for a power nap. The ostrich pillow can be used anywhere, on the bench, in the train, on your desk, anywhere you want to when you want to have a nap when you are tired and aren't finding a suitable place to lay your head.