I think what the post above yours is trying to say is that the company I work for has no say what I do with my 8 hours of sleep time. If I want to only sleep for 4 hours but I come to work and get my job done, who cares? It is my time anyway and they aren't paying me to sleep so why should they have a say? If my work is suffering, sure, they have a right to fire me but if I get my work done in the 8 hours, they have no say over the other 16.