Because grandma can use skill books.

If you can sleep, restore brain salvage value.

There will be no shortage of food.

If you want to restore the remaining brain value,

You can find green mushrooms or cacti and eat them when cooked (never eat them raw).

A small bag of green mushrooms can only be picked at dusk in broad daylight.

And hats or wreaths.

You can wear a beret later.

This hat is more precious because it has a certain chance of exploding when it touches a walrus. Remember to mend it with a sewing kit, and don't burst your hat.