Sleeping breaks some redstone machines.

[EndCod3r]

If you sleep while you have a auto-sorter sorting items, some items won't fire out of the dropper and will have to be taken out and put back into the auto-sorter.

[Steveplays28]

Hi, that's due to a limitation with the redstone/block entity speedup. You can disable this speedup or lower it to make the actions of the speedup happen more consistently without skipping anything.

I'll keep the issue open though, but this one probably won't be fixed, unless I learn how to speed up redstone and Create machines in a better, more deterministic way without occasionally breaking them.