To Sleep

1. The speaker of this poem is addressing Sleep. Personification.
2.  The metaphor the speaker makes is likening sleep with death. Sleep is an embalmer because it makes the body still and preserves it as if dead. Many people liken the dead as looking asleep so why not go the other way. 
3. The speaker thinks forgetfulness is divine because when one forgets all the troubles and things they need to do in life then there is no stress and nothing to worry about and so one can be at peace. 
4. Sleep saves him from brooding over events of the day and so he values it because can escape from life.
5. He describes it as his "curious Conscience". He uses personification, simile and alliteration.
6. He uses the metaphor of comparing his soul with a casket. They are alike in the way that the soul contains various things and into which one can't really look. 
7. Sleep is like death in the way that death is often considered the final long rest. As in where someone is buried is their final resting place. 
8. He seems to be a great fan of sleep and so it would look like he would welcome death as a final escape from life. 
9. This poem is different from "Death be Not Proud" because it welcomes death and is kind towards it rather than condescending and downright rude.