Occurrences: Sam has immunities to demonic attacks that steadily expand over time.
At first, Sam was vulnerable to all forms of demon powers, being easily overpowered by telekinesis from both YED and lesser demons.
Killing a demon creates the same light inside their body as when they're killed by the Colt or Ruby's knife.
When killing Alastair, Sam was able to do so with ease, but Lilith required extreme concentration and will, the result of which drained him of all his powers upon completion.
– Sam Winchester, 4.04 Metamorphosis Sam, and Dean's, middle name (if they have one) is unknown.
Initially they only occur when he's sleeping (through dreams), but by 1.14 Nightmare they occur when Sam is awake.
As the series progressed, Sam has learned to further develop his powers allowing him to exorcise demons from their human vessels and eventually to kill demons.Sam tried to repeat this ability afterward but was unable to do so.In fact, his telekinesis did not manifest again until after he began training with Ruby and drinking her blood.Occurrences: Sam can force a demon to leave its host through sheer force of will.Initially, using this ability caused Sam a great deal of stress and would often result in severe headaches and nosebleeds, but with time and practice he was able to exorcise a demon without these side-effects.