I just write when I am happy, when I feel sad or anxious. Sometimes in the morning, maybe late in the evening, often when the sun is risng, most of the times I have ideas  when I'm driving, during the shower, walking around, meeting people, talking to friends or strangers. Most of my dreams are flashes of stories, some are unreal,  some are so true that seems that I have  really lived that situation.
I think of a history when I am listening to music, when I am preparing a meal, watching TV....When I travel, visit a new place, when I swim.
So I feel I am a writer only in those situations, not most of the time. :)