I could set my calendar by my seasonal mood swings. I get depressed in the late fall/winter and manic in the spring and summer. This year I haven't been manic, which is unusual, but I've had several med adjustments in the past few months and the new regimen is keeping me on an even keel. It's all related to changes in the angle of the sun's light, which are most noticeable in the spring and fall. I'm especially sensitive and I have to use a light box during the dark and cold months, while in the spring and summer months I have to wear special amber lenses in the evening so I can go to sleep at a reasonable hour. Otherwise I am apt to stay up all night despite the combination of "downers" I take at bedtime.