I always use sleep with a 980M, latest drivers and latest win10 updates (not insider). I didn't encounter specific issue. Did you try DDU and installing drivers from scratch ? Please stop just mentioning "why are you using sleep" or "you shouldn't use sleep" etc... The OP asked for a specific issue and potential solutions, not for your patronage in not using normal features on a computer... And we don't all have super fast SSD, super fast ram and CPU so it actually does matter whether we use sleep or not.