sleep troubles`

ok so sometimes when i got to bed ill be sleeping really good than all the sudden it feels like my brain is jumping up and down and when i open my eyes it will look like the room is jumping up in down really fast and it scares me to the point i jump up and it goes away but than i have this horrible headache. it has happened to me before but lately its been happening alot and it really freaks me out. could anyone be any help to this??