I used to work the midnight shift and evening shifts when i was still doing computer support -- either 2pm-midnight, or 9pm-7am depending. Even when i was on the evening, by the time you get home, eat, play some video games to try and keep to the midnight schedule (i was more of an avid gamer than I am now), it would be going on 9am and time for bed, then wake up and repeat.

I think i was generally getting to bed anywhere from about 6am - 9am, and sleeping as much as I could before work again -- makes having a social life difficult unless you end up buddies with people at work or on the internet.

Its taken me almost 4 years of being on 'day-shift' to get used to not going to sleep at what everyone else considers 'strange' hours. Now if i manage to stay up past 11pm I consider myself lucky. Getting up early in the mornings now allows me to see the sun rise from the other side as it were


Edit: To answer the original question, yes -- every day ran into each other. Either it was a 'Work' day or a 'Sleep' day (weekends and days off) -- and it does kind of cause confusion sometimes. I had to ask people often 'what day is it today ... no, not the 14th, what day of the week' and get strange looks sometimes