I experienced this too when I was 15! But frankly, this is not 鬼壓床!No ghost can ever do that and no ghost exists in this world. There are only organic and inorganic beings 
You experience this because you are aware that you have fallen asleep, that is , your body is in sleeping mode and your awareness is still there.
If you experience so while dreaming, that is , you realise that you are sleeping while dreaming, you can have control over your general dream situation and this is called 'dreaming', a technique devised by ancient sorcerers. If you happen to wake up in your dream, you can quickly find your hands (starting point) to generate your dreaming attention, and then you glance at everything in your dream sparingly. When images start to dissolve, you look at your hand again to saturate your dreaming attention, if not, you will lose control over your dream and it becomes normal dream again in which you have no volition over it. Well, finding hands or finding any parts of your body is just a pointer, definitely not a way. Some modern people call this out of body experience but in fact, you are engaging in shifting your assemblage point while dreaming. |