: Safe to leave eggs in water overnight? I want to have boiled eggs in the morning when I wake up. For this I want to use a standard rice cooker. My plan is to add the eggs and water before going to bed, set a timer and go

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Go for it. Eggs in their shell are pretty sturdy. Technically, a very small amount of water will be absorbed by the eggs, but unless you weighed them, you probably won’t notice.

I do have a small caveat, though: eggs are susceptible to smells, the chalky shell is pretty permeable. So if your tap water has a lot of chlorine or other strong tasting stuff, it’s probably not a wise idea to let the eggs absorb that. The same is true if you live in an area of the world where tap water may be contaminated by bacteria. In such a case, you need to boil the water first before adding the eggs.

In short: if the water is good, no problem.

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If you absolutely can not wait to boil the eggs in the morning and prepare your breakfast like the proper ritual it really is, you have to take these in mind.

Eggs are electively permeable. This means some molecules, like water, can enter through their membrane and thusly inflate it which will make it possible for them to break in boiling, or even before.
Can you really control the way they will be cooked in the rice cooker? Sure it's okay if you want the yolk solid, but if you want it liquid you'll have a problem.
Perhaps some taste or smell will seep through the membrane. For example metallic taste, chlorine used to clean water or worse anything health damaging.
If you pre-boil the water, leave it to cool, salt it to make the mixtures somewhat of the same concentration (where mixtures are the water and the inside of the egg) and don't care about cooking time you can have a safe go to try it. Look for weird tastes or odors.