Ghost/afterlife real or sleep deprivation?

I was asleep with pandora playing on my iphone for about 5 or 6 hours after some drinking, i always sleep really light when i drink beforehand anyways. Something wakes me you know like your body just wakes up so there i was awake in bed witha sleeping bag and pandora playing and i notice there's a clicking sound like a child running through the hallway, I think nothing of it and decide to turn pandora off since i fell asleep with it on, since i was awake now i wanted some silence, oh by the way i thought i was going to die because of an intruder. So, Once i turn off pandora the clicking becomes more audible and i start to panic because it sounds like someone is in my hallway, at this point I realise i need to get up and see what the **** is making this noise, not as soon as i say that, the clicking slows down to a slow halt and i very heavily feel a presence behind my right shoulder and i feel wow someone has a gun and this is the end, this is the freaky part. My sleeping bag begins to slide down my back as his someone grab it from the top and is removing it from my body, It last no longer than 1-3 seconds but as soon as i realise i need to take my right arm and swing it as hard as i can to hit the intruder, it stops, creaking of the hallway and the sleeping bag rest still. I realise it was an intruder because i would have been dead if it was and no one could run out of my room that fast either, could this be sleep deprivation?

Added (1). The only other time this has happened to me was last winter when my step dads father passed away, same thing i was sleeping and something just woke me, i notice a light very ambient from my left shoulder and turn to see a very visible floating ball of mist or smoke swirling and looking right at me, same thing there i felt a strong presence before i turned and had my fist clenched ready to hit. Oh and i have been having dreams of a classmate who passed away in a car accident lately.

Ghosts aren't real, so…

Yes, negative energies exist and are most active at night. They have the easiest access to us during sleep because we're inactive.

It would be good if you can try chanting the name of God so that you can have protection from negative energies.