Ok, so i have read about sleep paralysis...but can anybody explain this to me....

Before i fall a sleep, and am still kinda awake ish..but like tired..these weird visons come into my head..like the most effed up sh!t! Like weird cartoons, dungeons, just random scray and weird things i defonitley wasnt thinking about..like then..i dont know if it could be a false awakening aswell..but its like..i see all these black pebbles moving in the corner of the roof, and i open my eys like wtf! But iv litrally been in bed for 5minutes...and then there is like a vison of this creature demon trying to break through my trilgate and get into my house...they last for like 3 seconds, and i keep waking up from them..even though im not fully asleep...its like being inbetwnn the two..is there a term for this?? Please..lol..thanks...