Modafinil is great while you use it for some specific situations, but it’s a bad idea to take one everyday. From my experience, doing even half dosage everyday made my body feel sick, my muscles were tense all day and overly exhausted. There are other drugs that are way better than modafinil.

I think it's because of the long half-life: it's about 15 hours.

I have over half a bottle from when I was prescribed it (for MS fatigue) and I can definitely still feel in my system after a day. And yeah, if I take it more than, say, 2 days in a row, I start having a bad time.

like ...?