Sure they do. It makes a lot of sense to conserve power when food supplies are low.
One difficulty is that many humans produce a “self” with split brains, a brain missing key components, or half a brain. That’s not consistent with materialism.
A recent experiment with mice showed data compression at work when the mice were making decisions about how to get a reward.
Eyes with lenses are believed to have evolved independently multiple times, but all evolutionary scenarios face insurmountable barriers.
Wilder Penfield concluded that free will is not in the brain — it is an immaterial power of the mind.