It's not what OP is asking about.
If the OP is interested in performance as it relates to sleep, this is probably an interesting area to explore. Metaphorically, if I see someone struggling to pick apples from a tree here, I might direct them to the low-hanging oranges on the tree there.
That said, I also did answer the OP's question up-thread.
I'm thinking that it should be possible to decide when to sleep based on reduced performance.
Can anyone suggest a tool for that purpose? Perhaps some reaction time testing software?
I guess I would have to track myself during the day to make a baseline, which is fine.
But without some sort of test I end up staying up way pass effectiveness, which is a waste of my time.
-Robin