I sometimes take my night meds later or earlier depending on whether I'm doing something that night. Lately I've been in a theatre production so I've been going to bed around midnight or 1 AM, so I've been taking my meds later than my usual time, which is 10 PM. I find as long as I'm not in the midst of an episode, my bedtime can be flexible, but if I'm even getting hints of hypomania or depression or am having trouble sleeping I need to be really strict with my routine.