I think i saw a Ghost?

well am 19 and i live with my parents and 2 sisters 10 and 17 yrs old in the same room well when my 17 yrs old sister goes to sleep i watch a movie from my laptop usually at 11 o clock and finishes at around 1am well a few days ago when i was about to sleep i tough i saw an old man next to my bed just staring at me i got really creped out but i just slept dint give much tough to it but yesterday when i was watching the movie "superbad" my laptop started tilting left and right first i tought it was my legs cause the laptop is by my legs when i watch it but it wasnt my leg so i stayed still and like 3mins later in tilted again then i got so freaked out but continued watching my movie like usual then like 5mins later it tilted left and right again and i got freaked out to the max so i just turned off my laptop and try to go tho sleep i was so scared what should i do?? anyone else had a similar experience?