As you are lying in bed, your mind begins to drift and you become increasingly drowsy. During this short, transitional stage of sleep you disengage from the routine sounds in your environment. This sleep stage is called:

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Quizplus · Accepted Answer

This question describes the characteristics of stage 1 of non-REM (NREM) sleep, which is a transitional stage where a person is lightly asleep and may experience brief periods of muscle contractions or twitches. REM sleep, also known as paradoxical sleep, is a later stage of sleep where a person's brain activity resembles waking consciousness and vivid dreaming occurs. Stage 2 NREM is a deeper stage of sleep where brainwaves slow down and body temperature decreases.

As You Are Lying in Bed, Your Mind Begins to Drift