Why do zombies spawn in my camp (Minecraft)?

Hello, almost every time I go to sleep in Minecraft, and then go to my warehouse (under the house), zombies, creepers or skellets spawn there.

Why is that?

The spawns even in poorly lit areas.

You have to illuminate every small spot, only then you have peace.

It was the same with me.

The light level is too low! Illuminate the entire room, then you have no more unwanted visitors.

Because there are some points where only light level is 7 or less. Then mobs can spawn. You have to illuminate that more. 4 torches are not enough for such a large room. Just look with F3 to see where the light level falls below 7.

In the far right in the corner it looks dark, in the middle right it also looks dark.
Stand on each block and see if the light is at least 7.
If not, then monsters also spur

Actually, he can't press F3 because he's playing on a PlayStation.

Oh right. I didn't pay any attention to it. Then he has to guess where the light is too dark. Or get a PC and play real Minecraft.