So, me and @CircuitBoardProductions were watching the FNaF 1 trailer, when we noticed something...something familiar...I faintly heard, "Secrets that you keep." We did a bit more research, and we were actually able to prove what I heard correct. The video above was made by @CircuitBoardProductions to test our theory; the drum beats and vocals sync up PERFECTLY to the original song. Granted, there is a bit of an audio effect in the trailer, but it is still there nonetheless.

Everybody is theorizing on why the song was used in the trailer for the FNaF Movie; maybe something to do with the fact that the song was released in 1983? Nope. The reason that "Talking in Your Sleep" is in the FNaF Movie trailer is because it is a reference to the first FNaF trailer. A reference we never heard or got...until now.