Collection of childhood creepy incidents: visions, sounds, and forest voices

Not much creepy stuff has happened in my life over 18 years. And even then, most of it is just strange stories rather than creepy ones.
I'm writing whatever I remember, in no particular order:

1- When I was about 5-7, after waking up from a nightmare, I opened my eyes and saw my sister standing in the corner of the room, who after a few moments just disappeared.

2- At 9 years old I was left home alone. Sitting at the computer, I heard the couch in the next room bending and creaking. Thinking it was the cat, I ignored it. The sound repeated, but by then I realized the cat had been in my room the whole time. Shitting myself, I tiptoed to the kitchen, armed myself with two knives, and went straight to the room with the couch. After checking the room, I made sure there was no one there, and went back to mine. The creaking stopped.

3- At 9-10 years old, at night I watched with a friend as a hum and bright blue flashes came from over the forest above the trees.

4- At 8 years old, I woke up in the middle of the night because an unfamiliar female voice was calling me from the hallway. I buried my face in the pillow and fell asleep.

5- At 11 years old, toward evening I got lost in the forest. Walking through the forest looking for familiar landmarks, I periodically heard distant voices (male and female) and howling like "ooooooh". I got seriously freaked out by it, since at that time I'd heard all sorts of stories about creepy stuff in forests, so I went in the opposite direction from the sounds, came out onto a familiar path, got my bearings, and headed home. I told my grandpa about those voices, he crossed himself and said they were the spirits of people who died in the forest luring me to them, and it was good I didn't go toward them. (grandpa was a bit of a nutjob, by the way)