Screaming or howling

#1 Racing through Trackmania-like obstacles, loops and such, but with speedboats. My classmates appeared as my opponents for this year's annual race, which happened to take place on a very nice and sunny day. After being the first to complete the track on water, with my classmates right behind me, we left our boats and ran onto land. The race went into a big abandoned hotel. As I entered the building, I noticed it was very dark. Looking out of its windows, it appeared that it had now suddenly turned night. A few light bulbs lit up the labyrinthy corridors here and there, but not even enough to cover half of the shadows. I heard a lot of strange noises, and saw some shady figures, but never got a clear sight of what was hiding, just waiting for us to approach. One of my classmates clung to me, which I found was somewhat an annoyance. We went up a flight of stairs and to the left, where we were met by the moans and screams of something that had just started chasing us. I did not get a look at it before it came out of the darkness, but I had an idea of it being a humanoid creature, possibly similar to what one might find in the Dead Space games. We ran for our lives back past the flight of stairs, where I now noticed a set of numbers, but this time we ran to the right. I passed a chair which had a body in it, laying completely motionless and in a position as if it had plumped down from the ceiling in a lying position and just landed on the chair (arms sticking out to the sides, legs stiffly in front of the chair, sitting off the edge of the chair). I did not have the balls to look it in the face to find out whether it was alive, or if it was one of my classmates - knowing it could suddenly spring up and scare me - so I just ran past it. We figured the set of numbers was the place we had to go for the race, but we did not get a specific letter (the hotel had some special mirrored room-number system so the right half had the same room numbers as the left half), so we were not sure whether we had to run back to the left of the flight of stairs or take the door leading out to the fire escape. We decided not to go back to the creatures, and just wanted to get out of that hotel. When we got outside, it was indeed night time. We got to the ground, and noticed the host of the race as well as the remaining participants sitting in the lobby watching an old movie on a projector. Apparently three classmates were lost in the hotel and the race was called off. I woke up after this part, but it continued in another dream. #2 The host and I went to search the hotel for the missing classmates. As we entered each room, the host had to do something with his briefcase before we could continue, often resulting in a creature creeping up on us and scaring the shit out of us by screaming from behind when we least expected it. I was scared shitless of creatures hiding somewhere in the rooms we entered, such as behind curtains, in the bathrooms, or behind the bathroom curtains, so I checked every possible hiding spot. We never found the missing classmates.