Yeah these are called brief awakenings and are experienced commonly every night. The amount you recall depends on level of external stimuli (Noises and sounds, being shaken awaken, bright lights, discomfort etc); state of mind, position in sleep cycle and such.
A whole bunch of things basically..
-If theres enough stimuli you wake up.
-If there's next to nothing going on you usually drift off back to sleep almost immediately (Within seconds).
-Anything in between you should recall more often then not. (You see this as briefly waking up because of the bus driving by on the street outside, or your dog walking down the hallway for example. Usually these things are not enough to wake you up alone but when they happen during a brief awakening it pulls your awareness out of the sleepy state.)
I guess to answer your question this is the time you usually reposition yourself. If you know someone who snores watch them while they sleep;(Kinky right?) and you'll notice whenever they move their breathing will readjust, snoring will stop temporarily etc. They usually don't 'wake up' so to speak; but their body does and is very vulnerable to stimuli.
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