Sleeping for the 4 hours gives you a minor health buff. But yesterday I noticed that while buffed, if you eat a food that gives you an HP buff, the sleeping buff seems to be multiplied by the effect of the food. As you can see in this picture, I used the food that gives +45HP for 600 seconds and my HP went from the 130s to 5260!!! LOL! (The 0 is on a second line).
I’m only assuming this is a bug, but if it’s not then ignore me!