Which tiny evening task makes the next morning easier?

Morning advice often starts by adding more things to the morning. That may not help when the real problem is hunting for keys, discovering an empty lunch container, or remembering a form just as everyone needs to leave. A few minutes at the right time could matter more than an ambitious routine.

What small task is worth doing the night before? Looking for ideas that take little energy and actually survive a busy week. Please include what tends to derail the habit too. A useful suggestion should still make sense on an ordinary tired evening, not only on a wonderfully organized Sunday.