I'm sleepy

Verses Eccl 5:10-13,17,19-20 support Step 4 of “What’s Wrong With Wanting Wealth?” intrigue me because of verse 12a: “The sleep of the worker is sweet”. John Piper said, “God can perform more good for those who trust Him while they sleep than they can perform with anxious labor for themselves while awake.” Why do you think the average length of a night’s sleep is getting shorter?