A study to test this would be simple - test skills level at something (e.g. chess), and then have the study participant study "in their sleep" for a month. Test again. It has never been done. Not even close. As it has never been done, I strongly believe you are misinterpreting / over-stating your results.
A study to test this would be simple - test skills level at something (e.g. chess), and then have the study participant study "in their sleep" for a month. Test again. It has never been done. Not even close. As it has never been done, I strongly believe you are misinterpreting / over-stating your results.