I disagree with tng. I don't think anyone cares. I have sent workplace questions to admin assistants at all hours and on weekends and most of them reply at all hours and on weekends. Then we chat about why we're crazy enough to be working at all hours and on weekends. A half day off somewhere might mean that someone is catching up between midnight and 5:00 a.m. or on a weekend. Also, times on email might not indicate when it was written and sent. For example, even on hubski there have been weird delays. I'd notice a shout out to me, but might not receive the notification for a day. For example, I still have not received a notification for this shout out from steve. I don't know why. Remember, though, when you write an email at 2:00 a.m. it might not be in the best shape. It might be good to proofread it and send it in the morning, just so you are looking at it fresh. - that is, if it is a new cover letter. Edit: I see that the wise and brilliant insomniasexx made this point already.