Think one piece pajamas are just for kids? Think again! The one piece pajama has made a comeback among celebrities and normal people alike. New pink onsie pajamas are all the rage around the country. Celebrities from Miley Cyrus to Liam Payne showed off their stylish holidays onesies pajamas for adults recently by posting selfies in them all over the internet. Now, some of this makes some sense. Americans love their sleep. The average American adult spends nearly nine hours a day asleep. Almost 75% of all Americans wear some sort of pajamas to bed. If you are curious, about…