I'm sorry, this is rubbish. One of the reasons Modafinil is useful is that it will help you stay awake and alert for long periods AND when you want to sleep you still can do. It isn't like speed.
Yeah, I'm afraid you're definitely wrong on this. I've used Modafinil extensively at several different doses. Even at a quarter pill (50mg) you will struggle to feel even remotely tired if you take it after 9am (assuming you go to bed at a normal-ish time).
You should probably be saying "I" instead of "you". Anecdotally, I've never had trouble going to sleep even a couple hours after having modafinil. If anything, it's a more peaceful transition to sleep too. Modafinil makes me feel relaxed and refreshed. Like going to bed after taking a shower, or being in a hot tub or something.
It is categorically impossible (for me) to sleep on Modafinil, or it is at least significantly harder than on amphetamines (which I'll grant you can sleep on... Sometimes).
~15 years of taking Adrafinil and then Modifinil on prescription and "recreationally" says otherwise. The actual effect of a drug and then the psychosomatic effect of those who expect it to have a certain effect are two very different things.
