Flashcards in Sleep and Dreams Deck (8):
-biological clock (controlled by hypothalamus).
- Provides approximate schedule for physical processes
Suprachiasmatic nucleus (SCN)
(in hypothalamus) sensitive to changes in light
How does the Suprachiasmatic nucleus (SCN) react to little light?
SCN tells pineal gland to secrete melatonin
How does the Suprachiasmatic nucleus (SCN) react to more light?
SCN tells pineal gland to stop secreting melatonin
What is Rapid eye movement (REM) Sleep
- “Paradoxical sleep”
- Eyes move back and forth
- Heart rate, blood pressure, breathing – rapid or irregular
- Sleep paralysis
Stage 1 of N-REM
-similar to drowsiness
-Hypnic or hypnagogic jerk
Stage 2 of N-REM
– true sleep – reductions in heart rate and muscle tension