Perhaps you could do something I saw on a video. They put a sticker on everything then took the sticker off when it got used. If it has a sticker on at the end of the time period, it went.
Perhaps this could be done in reverse. Mark things you use and remove the rest.
As for simplifying, I have gotten rid of a lot of stuff over the last 12 months but just seem to refil the spaces. I give up - for now.
There is no such thing as lack of sleep, only caffeine deficiency.