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We do this , but won't have a clue we did it ,

Sometimes it leads to fantasy , sometimes just nothing ,

Sometimes long , sometimes short ,

It is most useless thing humans are doing from generations ,

What is this useless thing ..?

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    $\begingroup$ Too broad. There are many things that will fit the description, like dream, love etc. You should add more details to make sure the answer will be unique. $\endgroup$
    – AeJey
    May 25, 2017 at 7:03

2 Answers 2

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Is that

A dream ?

We do this , but won't have a clue we did it ,

We dream , but in morning we forget it

Sometimes it leads to fantasy , sometimes just nothing ,

self explanatory, sometimes its just a blank dream

Sometimes long , sometimes short ,

dream's is long and short at times

It is most useless thing humans are doing from generations ,

Dreams doesnt help us anyway

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is it

sleep?

We do this , but won't have a clue we did it ,

people don't tend to be conscious when sleeping. it is also true that noone knows exactly why we need to sleep

Sometimes it leads to fantasy , sometimes just nothing ,

you dream when you sleep, however if you have various substances you might sleep dreamlessly

Sometimes long , sometimes short ,

You can sleep for hours at night, or shorter during a nap

It is most useless thing humans are doing from generations ,

Everyone sleeps, in all generations, and noone can do anything while sleeping, making it useless

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  • $\begingroup$ Isn't sleeping good for health? :) $\endgroup$
    – Techidiot
    May 25, 2017 at 6:01
  • $\begingroup$ Not just good. But is necessary. ;) $\endgroup$
    – AeJey
    May 25, 2017 at 6:10

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