Nai Nai & Gang: An Unforgetable Experience

It was 18th last month my sister and I joined a 5 days 4 nights tour to Hanoi / Halong in Vietnam. On arrival we were transfer to the hotel in Hanoi and we stayed there for a night. The next morning, after breadfast we had a four hour journey (by coach) to Halong for two nights. On the second night in Halong I was awaken by......... I heard some noise in the room. When I opened my eyes the TV was on. I thought it was my sister who switched on the TV, but she was sound asleep when I looked at her. Without hesitation I switched off the TV. I was so pissed that I can't sleep because of that, trying to figure out why things happened.

After half an hour or so, something weired happened again I could hear some noise, within second the lights in our room switched off and on for many times. I quickly jumped over to my sister's bed and told her that I wanted to sleep with her. When she started to talk to me all the lights went off, things happened very fast, again the lights as well as the TV were switched on again.
I asked my sister softly weather I should switch off the TV. She told me "OFF IT LA" I tried many times to off it but I can't. I was so nervous at that moment, luckly my sister was brave. She tried to talk loudly to me by making noise and the TV was switched off finally.

I don't expect everyone to believe.........Because I know this is very impossible. I am just wondering does anyone know something like this, OR do you believe ghost exist? Due to this weired happening, I think this was one of my most unjoyable trip that I had............!!