text: Yo, check it out, we conducted a study
  Short sleep episodes, tryna find the key
  Subjective sleep quality, timing, and the content
  Of the sleep we get, yo, it's relevant
  
  Eight subjects in the mix, ready to roll
  18 four-hour sleep episodes, we're in control
  4, 8, and 12 hours awake before bed
  Different times of day, that's how we spread
  
  In a sleep lab, no disturbances around
  ANOVAs and regression, let's break it down
  Subjective sleep quality, calmness of the night
  Falling asleep, 'sleep through' ability, alright
  
  Number of awakenings and sleep latency
  Showed a pattern of better sleep, can't you see?
  More time awake, closer to the circadian low
  Morning hours, rectal temperature's the flow
  
  But ease of awakening, it's a different tale
  Increases with time awake, that's the detail
  And as we get closer to the morning's peak
  It decreases, yo, that's what we seek
  
  Multiple regression, let's analyze the game
  Subjective sleep quality, what's in its name?
  Calmness and ease of falling asleep, they predict
  Among subjective measures, they interconnect
  
  Total sleep time and slow-wave sleep, so prime
  Stages 3 and 4, they're in the line
  They predict subjective sleep quality, no doubt
  Physiological measures, they're what it's about
  
  Ease of awakening, let's see what's in store
  Slow-wave sleep, it predicts it for sure
  In a negative way, it's got an effect
  And the circadian peak, yo, you gotta respect
  
  The results show that wakefulness duration
  And the timing of sleep, they got the formation
  Of the physiological expression, it's profound
  And that determines how our sleep is renowned