Below sounds like the same effect of having a bad partner that was a cheat, or untidy. possessive etc, how many times have we seen people escape from this only to then miss them and yearn for their return even though they know it wont be a good thing :-)
After more thought, I realized that besides those effects of Piracetam, there's one more.
We associate so many attributes to being human: physical drive, sex drive, sleep, tiredness, emotions, breathing, eating, and of course those that happen in the latrine, if y'all know what I mean
There's a sadness, like having a part of myself missing. Even though I didn't like that tired, sleepy, forgetful part. But as humans, it is both out weaknesses and strengths, and all their respective peculiarities and individualisms that define us. They give us the shared bond of common humanity; common traits. Common even with ourselves as single individuals, varying only gradually with time.
Those things that Piracetam polished away in me, even though I hated them and fought them with every other weapon I could find - they were still cherished in some perverse way, some instinctual way. Like favorite colors or favorite foods, the common capabilities, limitations and habits of a person's body become their mental fingerprint. Baked into their daily routine, snug as a bug in a rug.
When one or more are quickly or gradually snatched away, sometimes it leaves a hole. Even bad things. And nothing ever really fills that hole, with its peculiar shape and depth. Sometimes it feels sad to not remember what being tired was like, because I can't remember anymore what it feels like to be sleepy. It was the usual way to end a day.
Now that it's not there anymore, there is no natural end to a day either. Like someone pried off all the numbers on a clock, now all I see is the hand moving, but my body no longer says anything about how 'late' it is. It's just a number now, there's no difference between 'afternoon', 'evening' and 'late at night'. Instead, time is just a continuous flow with hardly anything inside me to give it discreteness.
Now that sleepiness and tiredness are gone, I can't remember their bad sides. Like some old friend you idealize him after not being in contact for so long.
That's how it is with me.