I was inspired by an addiction to riddles

Question

Inspired by this Addicted to Riddles puzzle by @BrentHackers, I have created my own addicted to riddles puzzle. So...

How do you know if you're addicted to riddles?

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1.

My silky feathers serve a rest,
Beneath a gentle crown of dreams.
The eight hours I manifest,
Is often quicker than it seems.

2.

I am the wool of a sheep,
But I cannot ever be sheared.
I can be found never deep,
Unless when thoughts have appeared.

3.

I am the shield of a mind,
Bringing death to the heart;
I am a sword for pirate kind,
Showing life for a mortal start.

4.

As the present of the past,
I am still, but never idle.
Your mem’ry may not last,
Thus, I keep it with a smile.

5.

I thank the trees as a pencil’s friend,
So pale though never in fright.
In shedding a tear, I will likely bend,
Though eyes only earn my despite.

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What do all of these riddles have in common?

There are two answers: the obvious one, and the not-so-obvious one.

HINT RIDDLE: $\;\dagger$

I’m made of glass, this much is true;
But when you look, you won’t see through;
When there is one, I can make two;
Reflect on this to find a clue!

$\dagger$.

_{This riddle is not mine. I will credit the source of the riddle after it has been solved in order to not spoil the answer, for those who wish to look at the hint. It can be found here.}

SECOND HINT RIDDLE:

When together, we might have a spine,
On a shelf, though we have not one bone.
Either blank, with a graph or a line,
I'm a sheet with no cotton to own.

The last answer is what I define,
But it might just already be known;
And although I've a simple design,
Via me complex art might be shown.

Answer 1

The answers are: 1

Pillow. Eight hours of sleep go by rather quickly.

2

Wool-gathering credit to Mohirl. Also known as "preoccupation" or "inattention".

3

Skull. "Shield of the mind" as it protects our brain. And pirates are usually depicted with a skull. It strikes fear into the hearts of others and maybe that is a metaphorical sword?

4

The answer is "Still" a synonym of photograph. Logic credited to Gareth

5

An eraser (Also known as a rubber ). "Friend of pencils" as it erases the mistakes made by them. Bends in shedding a tear, this can either mean bending while erasing a drawing of a tear or it can tear the paper if used too roughly. And lastly "Eyes earn my despite", poking holes into them to make eyes only ruin it.

Thanks to Gareth and Mohirl. These should fit the answers in the riddle with the hint

Mirror

Answer 2

Theese are probably the obvious ones!

1. My silky feathers serve a rest, Beneath a gentle crown of dreams. The eight hours I manifest, Is often quicker than it seems.

Obviously something to do with sleep - a pillow is generally made of feathers and lies "Beneath a gentle crown of dreams"

2. I am the wool of a sheep, But I cannot ever be sheared. I can be found never deep, Unless when thoughts have appeared.

Missing this one as answer confirmed wrong

Fairly sure this is wrong, but woolgathering is absent minded, aimless thought - which obviously can't be sheared

3. I am the shield of a mind, Bringing death to the heart; I am a sword for pirate kind, Showing life for a mortal start.

Thanks to @R.D., this is

Skull

4. As the present of the past, I am still, but never idle. Your mem’ry may not last, Thus, I keep it with a smile.

A photograph? People generally smile in it, and it's a memento of the past that may outlast a memory

5. I thank the trees as a pencil’s friend, So pale though never in fright. In shedding a tear, I will likely bend, Though eyes only earn my despite.

   Paper thanks trees since that's where it comes from, and is usually pale.

Hint 1 seems fairly obviously

A mirror.

Hint 2 part 1:

Books