Does it safe to use modafinil in long term?

İ read that it has good outcomes on study.my question is does it safe to use modafinil at long term?

I had used modalert 100mg for 2 to 3 weeks it gave me sever headache.
After which I have stopped it.
I used to take it for excessive sleep.
Like 15 hours sleep.
After the headache my excessive sleep stopped as well.

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