I've always liked the idea of the journalling the most significant event of the day. To sit down at the end of the day and record that thing that stands out as the most important in a day lived. I think that if one were to do that, she would go to sleep at the end of the day with everything in perspective. I imagine that might be the best gift one could give to sleep.
No, I'm not doing that kind of journalling right now. Not faithfully, at least. But that photo was taken on a Tuesday; and as I recall, the most significant moment of that day was looking out my window and reflecting on the gradation of colour in that sky.