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For anyone curious, this is the passage I mentioned earlier, from: Echoes of other worlds by Tom Garner:

Somatosensory forms of tinnitus, in which the perceptual experience can be traced to an internal physiological source, have been documented but in most cases, the sensation is entirely psychological, with no physical correlate identified. Similarly, ‘exploding head syndrome’ describes a rarer condition in which individuals feel an intense and sudden explosive sound with no apparent sound wave. The experience is an example of parasomnia, due to it most commonly taking place during the transitional phase between sleep and wakefulness. If you have ever been awoken by the sound of a door slamming or similar explosive event but no one else nearby has reacted even slightly and there’s no trace of any possible cause, you may have experienced exploding head syndrome. Case studies conducted by Ganguly and colleagues (2013) evidence the above description and note that, to the individuals affected by the condition, the sound as it is experienced cannot be distinguished from that which has a physical correlate.