Riddle of the Day

[Gizmokid2005]

I weaken all men for hours each day.
I show you strange visions while you are away.
I take you by night, by day you take back,
none suffer to have me, but do from my lack.
What am I?

ANSWER (Congrats Cauzomb, Starshooter10, TL): Sleep.

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NEXT RIDDLE:

I'm as small as an ant, as big as a whale.
I'll approach like a breeze, but can come like a gale.
By some I get hit, but all have shown fear.
I'll dance to the music, though I can't hear.
Of names I have many, of names I have one.
I'm as slow as a snail, but from me you can't run.


What am I?