I stopped charting but yes it's very possible an I have done that. There are no "official" schedules or frequencies or patterns. I can be all over the map or off the map. I was feeling really GREAT for the past 2-3 weeks, was hoping it would last long er but I think I might be slipping in to a mixed mood now. I hope not. Mine is what you described minus the depression. I'm feeling pretty good now, but it's not as steady as it was.