1. The Importance of Sleep and Sleep Hygiene: Practical Clues for the College Student Roseanne Armitage, Ph.D . Professor Director - Sleep and Chronophysiology Laboratory University of Michigan M Sleep & Chronophysiology Laboratory

2. Functions of Sleep SWS – basic sleep drive – rest, recovery & homeostasis Body& blood cell work, immune system, Keep circadian rhythms entrained Stage 2 – maintain vigilance while sleeping REM - Memory consolidation, development of neural connections in childhood M Sleep & Chronophysiology Laboratory

4. POWER SPECTRA % ZERO-CROSS % FIRST DERIVATIVE POWER *FREQUENCY BAND WIDTHS DIFFER BETWEEN LABORATORIES AMPS A/D CONVERSION BOARD RESIDENT IN COMPUTER SAMPLING RATE 128-1000Hz BETA 12-32 Hz* SIGMA 12-16 Hz ALPHA 8-12 Hz THETA 4-8 Hz DELTA 0.5-4 Hz PSA or PAA RAW DATA STORAGE DIGITIZED VALUES OFF-LINE VISUAL SLEEP-STAGE SCORING

5. REM

6. Stage 4

7. A wake Move REM Stg 1 Stg 2 Stg 3 Stg 4 SLEEP EFFICIENCY: 96.8% REM LATENCY: 94.5 min SLEEP LATENCY: 7.0 min % REM: 13.3 % STAGE 1: 7.5 % STAGE 2: 57.0 % STAGE 3: 16.9 % STAGE 4: 3.5 SOS: 23:54:00 TIME OF NIGHT WUT: 08:51:30 HEALTHY NORMAL CONTROL

17. A wake Move REM Stg 1 Stg 2 Stg 3 Stg 4 SLEEP EFFICIENCY: 79.2% REM LATENCY: 49.0 min SLEEP LATENCY: 6.0 min % REM: 16.9 % STAGE 1: 17.0 % STAGE 2: 46.0 % STAGE 3: 0.0 % STAGE 4: 0.0 SOS: 01:04:00 TIME OF NIGHT WUT: 08:51:30 DEPRESSED PATIENT

20. HIGH COHERENCE LOW COHERENCE 100 100 0 0 EPOCHS EPOCHS % Time-In-Frequency % Time-In-Frequency C3 C4 .99 .43 100 200 300 400 500 600 700 800 900 100 200 300 400 500 600 700 800 900

21. Coherence in Girls at High-Risk HIGH RISK NC CUTPOINT= .70 >50 % of girls with extreme low values had 1st episode 3-5 yrs later M Sleep & Chronophysiology Laboratory

27. M Sleep & Chronophysiology Laboratory