Process your mental buffer from time to time

The short version: when you learn new things and come up with ideas and other thoughts, they are stored in your brain's buffer until you have down time to process the buffer.

If you keep putting stuff in there, you will eventually run out of room, and things will start to spill out without being processed.

Additionally, having stuff in the mental buffer means less processing power and capacity for the rest of the brain.

To gain performance and capacity, set aside time where you are not distracted by anything, and let your mind wander. That will allow time for the buffer to be processed, and remove some stuff from your brain.

If you are under some kind of pressure and can't find time to process your mental buffer, commit the thoughts to some kind of external memory such as computer text files or pen and paper.

That will empty the buffer, but note that no processing will occur, so it will be easy to forget these things. Try to take enough notes so that you may re-load it and process it later.