I typically work nights (11pm to 7am) and fill in swing (3pm to 11pm) as needed. Depending on my shift, I go to sleep anywhere from 5am to 10am. I sleep during the day, and typically get my 8-9 hours of sleep. Sleep hygiene is good, it's just irregular. I go to sleep at different times depending on when they need me.

This doesn't happen often, but occasionally I am asked to work days (7am to 3pm), sometimes a double (16 hour shift). So as you can see, though my sleep routine is fairly regular with a 5 hour bedtime window, occasionally I get thrown off that routine completely.