Our expert says:
Actually this sensation of "falling" just as one is gliding into sleep, is very common. I've wondered whether it's why we use the odd expresssion of "falling asleep". Generally it seems to be that as one's system drifts into sleep, sometimes the part of one's brain that controls muscle tension, relaxes it BEFORE one is asleep, and one notices this, feels as if one is falling, and jerks awake again.
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