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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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closed as too broad by AeJey, JonMark Perry, Glorfindel, Ankoganit, Rubio May 25 '17 at 11:11

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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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 '17 at 7:03
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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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1
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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 '17 at 6:01
  • $\begingroup$ Not just good. But is necessary. ;) $\endgroup$ – AeJey May 25 '17 at 6:10

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