brain varieties:
fluffy brain, my favorite, when ideas come in and float around and have some tea and drift away before any new ones appear.
crowded brain, the feeling of possible head implosion when there is too much going on in there, a pressure headache ensues.
relief brain, when you are able to release something that has been holding your mind hostage for far too long, either by way of therapy, crying or intoxication.
intoxicated brain, who cares.
thinking brain, when you are trying too hard, like when you come to the end of a list and you can't come up with anything else to say...