Just going to take this opportunity to say this, as it seems your post is vague enough to allow it. After recent LSD trips, I've discovered a more conspicuous continuity, as if fluid, between days. An upright bassist, psychology student at UH, and I came to a seemingly relevant topic of "the feeling that one has had a complete day."
I usually rest using 4-hour blocks; most days I use one 4-hour block and that is all I need. Each day, as I follow my routine, I notice that it becomes unclear whether or not what I have just experienced was part of this day, or the one prior, or if a certain, predictable experience _will be_ a part of the next day. It seems that one's "day" is held together not necessarily by a slicing up of temporal blocks, but rather a continuity of thought, a kind of mental stream. So, perhaps "a day" is merely a state of mind. The bassist noted that all sleep does is "radically alters or adjusts" one's state of mind.
So is it so clear that one should strive for a new goal "tomorrow" or, rather, a form of mental habit that succumbs to the demands, or necessities, of the goal?