i charge the same regardless of what time of day it is, ive been working flat out every night this week, 7 til late and then up at 9 to do my day jobs, would not turn any jobs away just for a rest as i know there will be days when i'm quiet so i'll catch up on my sleep then. personally, i think when your self employed, if the works there then take it no matter what, you never know whats round the corner, suppose its different for guys who have been going a while as they should have no probs filling there books, but new starts need it to build there business up.