Some days you sit down at your computer and you have a thousand emails from long lost friends, and you have no time to look at any of them. Other days you sit down and write a million emails, and then get none for a week. This is the way of it with email.
Some days you sleep so little it is arguable whether you napped or slept through the night. Other days you sleep for hours and hours. In either case, you can end up feeling well-rested, or extremely tired. Some days, you can't help from yawning even though you know that you slept well. This is the way of it with yawning and sleep.
Some days, you feel on top of the world, even if you have no reason. Other days, you have a reason to feel good, life is good, but you don't feel good anyway. Other days you feel bad because you've done something wrong. Or sometimes you do something wrong and don't feel bad. This is the way of it with feeling and right and wrong.
Some days you can be creative, write a poem and make some little origami out of paper and brighten someone's life with a witty comment, all without giving the situation too much consideration. Other days, you try your hardest, and only come up with sitting on the couch with an anxious feeling in the pit of your stomach, reading a book you don't want to read, waiting for time to pass so someone else with a better idea can show up. This is the way of it with creating.
Some days you're in love, and so positive that everything is fine, and you feel enriched and complete. Other days, you know you have love in your life, but need to be reassured. And on other days yet, the love you used to have ceases to exist. Or you feel like it might, and you're scared. This risk eats at you internally, and you doubt if you should have ever loved at all, if only to cease that feeling. This is the way of it with love.
Some days when you're happy, you need to listen to someone else's sad music to prolong your happiness. Other days, happy music will stop you from being sad. On still other days, you need to be depressed, maybe cry a little, listen to something horrible, and see that through to the other side. This is the way of it with sad and happy music.
The choice of what day today is, however, is random. It's up to the whim of some air current, or something in the water, or perhaps the way someone close to you felt yesterday, or this morning. There's nothing to be done about that. This is scary sometimes, and other times it's obvious and inevitable. Some days things are clear and some days things are not. This is the way of it with days. At least, in my experience.