This piece seems to be entirely about feelings of tiredness? That can be important in some sorts of performance but what the other effects of sleep. For insta

This piece seems to be entirely about feelings of tiredness? That can be important in some sorts of performance but what the other effects of sleep. For instance, the quality of your NREM sleep subsequent to learning new vocabulary or REM sleep after learning new motor skills has a large effect on how well the training takes. Do we have any evidence that people who feel the need for less sleep, e.g., learn new languages as fast as people who get 8 hours a night or do they learn them as fast as people who get 6 hours a night but use stimulants to prevent feelings of tiredness? I can actually imagine mutations that give people faster sleep spindles or something but that's very important for evaluating the impact of these sorts of genes.