Very Tall Cloaked Black Figure

Fairly regularly (4 or 5 times a month), I suffer from sleep paralysis. This normally happens when I am very tired (through research I have found that it is when you are really tired that it is most likely to occur). In a normal episode of SP, I get the usual unable to move sensation and a pressure on my chest feeling and I can't move my head. There are no presences in the room or anything. I can normally snap myself out of it pretty easily through breathing exercises and stuff.

Sometimes, a couple times a month, I get SP but it's not like normal. I can't move but there is no pressure on my chest and I am wide awake and I CAN move my head. I can look around my room like normal. The thing that scares me the most about these particular episodes is that there is a very tall black cloaked figure at the foot of my bed in front of my bedroom door. I would say about 7-9 feet tall, just standing there. I can't see any arms or any features at all for that matter. No face, but I can feel it looking at me. I feel intense fear when I see it. My breathing becomes extremely fast. It feels like I am hyperventilating. I try do what I normally do get myself out of SP but it doesn't work. It almost feels like the dark figure is causing it and it will let me go when it wants to. Normally after a few minutes, it just disappears and I am back to normal. At this point I turn the light on and try to get back to sleep with the light on. This normally happens around 3 am. Never exactly at 3 am, always just before of just after. This has been happening since I was about 12. I am now 22-years-old. My sisters have both had the same experience as me on several occasions.

I must add that my grandma passed away at the end of last year (this seems irrelevant as this has been happening long before she passed but bare with me). I saw the cloaked figure last week at the foot of my bed. I could still move my head around etc. I was extremely scared. I moved my head to the side so I wasn't looking at it and I saw something else. I was a disembodied head floating at the side of my bed. The face looked similar to my grandma's but it looked slightly different. Like something pretending to be her. It also had an evil smirk on its face. I tried to look away again, still unable to move my arms and legs. The head followed mine and the smile got bigger and more menacing. It felt like it was mocking me. Then it just faded away. So did the tall hooded figure and I kind of jolted in bed and got all the feeling back in my body. Now like I said earlier, every time I have seen this figure it was around 3 am. This time when I woke up it was closer to 4 am. So this either means that it just happened later than usual or the ordeal lasted about an hour (although it only felt like a few minutes).

This has really bothered me more than normal. As the hooded figure didn't really do anything, I didn't really bother researching it. Even though it felt evil, it wasn't causing any actual harm except for scaring the crap out of me. It's just that this time the floating head that looked like my grandma that makes me think that something else is at work too.

Can anyone shed some light on this?

Thank you for taking the time to read my story.