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.
What is made of wood but can't be sawed?
The more of it there is, the less you see.
Salty water everywhere but not sea in sight.
I have a face, yet no senses. But I don't really care, because time is of the essence.
What do angels sing in the shower?