Like Pooh, sometimes I sits and thinks...
'Sometimes I sits and thinks. And sometimes I just sits." Winnie the Pooh was my kind of philosopher. I have long said that I get my best work done in the bath. Or when asleep. Sleeping is good for thinking. Dreaming is not a waste of time. Things fall into place.
Dozing is even better though sometimes it is hard to sort out the chaff from the wheat. I know I have had a lot of thoughts in this state that I wish I had written down.
Daydreaming is a great way to get some brain work done. It works well on a lazyish walk, a walk where I know the beginning and the end, but don't have any hard and fast rules for what happens in between.