I would say I prefer night, but I am a "day" person currently because that is what my Bipolar schedule is right now. My husband gets up for work each day at 5 and he goes to sleep about 10 so I am in that routine. On the weekend I can stay up a bit later and sometimes I wake up a bit later, but I'm also getting up at 7:30 in the morning on weekends a lot of the time. Oh well, we are often taught to take to a routine in Bipolar, it's for the best, so at least I can say it keeps me level!