TIL that an experience that I've had ~once every month or so for my whole life, and assumed was near-universal, is actually relatively rare, and correlated with various bad things that I'm not aware of experiencing in relation to it (EBV infection, migraines, head trauma).

Basically, as I experience it (typically right as I'm falling asleep) everything visually starts to feel very small and far away, except that my tongue feels large and cumbersome in my mouth.

It's called Alice in Wonderland Syndrome; other people experience similar size distortions though the details vary a lot.