It scares me awake. I don't see anyone or hear anyone, just the sounds. These sounds don't occur together.
The knocking is most likely your pulse. Sometimes we hear the carotid artery beating when its real quiet, particularly if you're laying on your side, keeping outside sounds from that ear. I'm not sure what the whistling is, I have it sometimes. Changing position helps me. Its nothing important. The one thing I've noticed is sometimes its my breathing and if I cough and clear any mucous there it will go away.
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