Hey, sorry for the way late reply, but no, I have never gotten any insomnia from taking the Flourinated version, however, adrafinil has kept me up on numerous occasions, and I would make sure to take it at least 6 hours or so before bed, but I forgot that adra is a pro-drug for modafinil, so after it fully metabolized into moda a while later, that's what was keeping me up as the compound was then fully active much later than the initial dose... Sigh, I'm special ?.
I also think that taking the fl-modafinil (crl-40,940) during the day with my tianeptine, and taking the f-phenibut later in the day (which FL version of phenibut "knocks me out" instead of tweaking me out like regular phenibut does) probably is why I never had any sleeping issues when taking fl-modafinil, but this is all heresay at this point with these compounds heh.
Also, many of the erogeric effects developed about a 75% tolerance factor with me after about 2 weeks, making it much less effective at keeping me awake, while still maintaining the "nootropic" properties with no noticed tolerance.