I am a mathematics major and I constantly hear people (including my professors) saying that when you are not actively thinking about a given problem and playing tennis for instance your subconscious keeps thinking about it.
When I take a rest after hours of thinking and come back a couple of hours later to solve the problem I do not really notice major differences in my understanding. Here are some people that claim this is possible though:
- care2 - How to Solve Problems While You Sleep
- Medium.com - How to Solve Problems in your Sleep (Literally)
The latter of which links to an article in a journal on dream research as scientific basis for the claims.
However, is this actually possible, can you confirm that this actually happens?