As individuals drift into sleep, proprioceptive feedback is lost before full loss of consciousness, which can lead to a sensation of falling.

“as we're drifting off into sleep we start to lose that proprioceptive feedback Now normally that loss of propri acceptive feedback and sensation of what's going on and where my body is is is is before the loss of consciousness and so you lose Consciousness and that's then thereafter when the loss of propri reception happens and you don't have this sort of you know mental freak out of of propri receptive break glass in case of emergency but sometimes the speed with which those things happen changes and you start to lose the propri receptive sensation before you fully lose Consciousness and at that point your body says oh my goodness mattress has just disappeared and I'm falling got and that's where you can have these”