According to this article your pillow could be a breeding ground for all sorts of bugs. The article suggests that up to third of the weight of your pillow could be made up of bugs, dead skin and dust mites and their faeces. It seems your pillow is also an ideal breeding ground for bugs such as MRSA, C.diff, flu, chicken pox and even leprosy. The findings come after a study of hundreds of pillows used by Barts and the London NHS Trust. The tests found high levels of living contamination of the outsides of the pillows with germs having found their way inside the pillow through rips in some cases. In some cases the pillows were contaminated with E.coli whilst others contained germs that can cause respiratory and urinary tract infections. The problem, however, is not confined to hospitals with many people simply putting a fresh cover on their pillows rather than washing the whole thing. Based on this I wonder whether you are allowed to take your own pillow when having to stay in hospital.