Sleep! Oh I miss it so!

I have had a rough time sleeping this week. I went on a 4 day vacation and slept pretty good, now I am home and cannot sleep for 4 hours straight! It is driving me crazy and the lack of sleep makes me prone to headaches and those can make me very unproductive - that I really do not like. What do you do to ensure you get a good nights sleep? Or do you just make it through on 5 to 6 hours? HELP!!