Answer:
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.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
What has 4 legs in the morning, 2 legs in the evening and 3 legs in the night?
I am a good state, there can be no doubt of itΝΎ But those who are in, entirely are out of it.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.