Scoring Sleep

Question 1

N1 Sleep (psg criteria)

Answer 1

• Less than 50% Alpha
• If no alpha than any of the following:
  1) 4 to 7 Hz background with slowing greater than 1 Hz from stage wake
  2) Vertex waves (Central)
  3) slow rolling Eye movements

Question 2

N2 Sleep

Requirements for scoring

Answer 2

Both are needed

• Less than 20% Delta
• One or both during the first half of the epoch or last half of the previous epoch
  1) one or more K complexes without an arousal (frontal)
  2) one or more sleep spindles (Central)

Question 3

N3 Sleep

Answer 3

-Greater than 20% of the 30 second epoch
is Delta sleep (six seconds)
-Delta wave is less than or equal to 2 Hz and greater than 75 µV
-Sleep spindles may continue

Question 4

REM sleep (psg features)

Answer 4

• LAMF EEG (resembles N1)(Alpha activity may appear)
• REMs
• Low chin EMG tone
• If epoch has REMs and chin EMG is low then score as REM sleep even if K complexes or sleep spindles are present (This often happens during the first REM of the night)

Question 5

Stage wake

Answer 5

• Greater than 50% Alpha
• If no alpha than any of the following
  1) Eye blink 0.5 to 2 Hz
  2) reading eye movements
  3) irregular conjugate eye movements associated with increased or normal chin EMG