In Once Human, you need to stay vigilant while exploring the areas, as you can lose your Sanity, which is tied to your health limit. So, knowing how to manage and restore your Sanity is crucial for survival.

There are two ways to restore Sanity in Once Human: consuming Special Dishes or medicine and returning to your territory (or base, as most people call it) and sleeping on a bed. The latter will be crucial early in the game as it restores Sanity and health and is easy to craft.

Once you have a base, you can craft a bed by unlocking the bed blueprint from the Basic Furniture 1 node in the Memetics Buildings tab.

From here you can craft a bed using 20 Logs and three Adhesives (you get these from taking apart items and sometimes from storage crates). Once you have your bed crafted, place it somewhere in your base and go to sleep. It will do wonders for your Sanity.