Four rules:
1. Think about it as much and as often as you can.
2. Avoid thinking about anything irrelevant or time-wasting.
3. Take 10-20 minute naps.
4. Get a good night’s sleep
This is all to do with the way the brain works. If you think about something a lot your brain cells will make connections and those connections will get strengthened. So if you think about things which are important to you your brain will automatically produce a web of connections.
The trouble is that if you think about irrelevant time-wasting stuff, your brain cells will be producing a web of connections about that as well. And there is a limit to how much stuff your brain can deal with at any one time. Do you really want your brain to be full with a web of connections about why x said y to you at the party last night?
Central to the whole process is sleep because it’s when you are sleeping that your brain strengthens the connections of what you have been thinking about, It’s also when it clears out unnecessary stuff. How does it know what’s unnecessary? It’s the stuff you haven’t been thinking about.