Electrophysiology of sleep

1. Sleep stages identification
slides pdf shared for
students
Dr. Sachin Arora
DAMS Psychiatry

2. NEET PG 2020 q. The marked EEG in below image
is of: (BOXED)
A.Sleep stage 1 (N1)
B. Sleep stage 2 (N2)
C. Sleep stage 3 (N3)
D.REM sleep
DR SACHIN ARORA

4. Electrophysiology Of Sleep
Sleep
stage
Associated EEG pattern & characteristics
Awake Beta waves (13-30cps)
Alpha waves(8-13cps)
Active mental
concentration
Relaxed with eyes
closed
Stage 1 ◼ Mixed frequency pattern
◼ Theta waves (4-8 cps)
Onset of sleep with
waves
slow rolling eye
movements
Lightest stage of sleep
↓ Pulse, respiration & BP

5. Electrophysiology Of Sleep (Contd.)
Sleep stage Associated EEG pattern & characteristics
Stage 2 Sleep spindle &
K-complex
Largest % of sleep
Rapid eye movement
absent
Reduced EMG level
Disorders – Bruxism
Stage 3
20% <δ< 50%
&
Stage 4
δ >/= 50%
Delta (0-4 cps)
(SWS)
Deepest sleep
↓ with age
Most relaxed stage
Disorders-night
terror, sleep
walking & enuresis

6. Sleep stage Associated EEG pattern & characteristics
REM
sleep
Bursts of 3 -5 Hz activity
NO EMG activity
Saw tooth, beta, alpha, theta
waves
Dreaming, penile
erection,
& vaginal lubrication
↑ Pulse, respiration,
BP & gastric
secretion
Muscle atonia
↓ with age
Peak REM - 5-6AM :
most of deaths due to
cardiac problems
Electrophysiology Of Sleep (Contd.)

7. Question (AIIMS) The column 3 of polysomnography
set in the given image corresponds to which stage?
A.Awake stage
B.REM stage
C.NREM stage
D.Drowsy
due to medications

9. Q : Eye movements of sleep stages was
recorded and which sleep stage the given part
of graph represent:
A. REM
B. NREM 1
C. NREM 2
D. NREM 3
# INICET MAY, 2022