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.
What am I?
When I'm lost, I hurt the most, as well as when not had at all. I’m often hard to express and easy to ignore. You can give me to just one person, or to many. What am I?