You get many of me, but never enough.
After the last one, your life soon will snuff.
You may have one of me but one day a year,
When the last one is gone, your life disappears.
What am I?

(A birthday.)

I make you weak at the worst of all times.
I keep you safe, I keep you fine.
I make your hands sweat, and your heart grow cold,
I visit the weak, but seldom the bold.
What am I?

(Fear.)

Double my number, I'm less than a score,
Half of my number is less than four.
Add one to my double when bakers are near,
Days of the week are still greater, I fear.
What number am I?
(Six.)

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?
(Sleep.)