I weaken all men for hours each day.
I show you strange visions while you are away.
I take you by night, by day take you back.
None suffer to have me, but do from my lack.
Answer: Sleep.
This riddle appears in the following downloadable PDF files:
Can you solve one of the most famous logic puzzle ever?
Memory Matching game for kids, adults and seniors.
Connect the matching tiles and pop them all.