My strategy with modafinil is to dose on the weekdays - so 5 days in a week.
I start with a half dose (100mg) on Monday and Tuesday, basically to get a better sleep, and with the tolerance going up, I'm also upping the dose to 200mg. But there are weeks when I stay on 100mg the whole week.
On the weekend I go without modafinil. I often sleep a lot, I think the body needs a break.