Sleep Disorders Flashcards
Sleep is composed of 2 distinct states
NREM (stag 1-3) and REM
In the sleep cycle, what do older adults have less of?
NREM- stage 3
(Less slow wave sleep SWS)
Because adults have less of NREM SWS how does this affect the REM sleep
Lighter more fragmented sleep
Generalized slowing of the electroencephalographic activity characterizes the transition to what?
Transition from drowsiness to light sleep (stage 1 NREM)
Emergence of sleep spindles and k-complex waveforms accompany what stage of sleep?
Stage 2 (onset of deeper sleep)
Desynchronization of slow delta waves characterizes what stage of sleep?
NREM stage 3 (slow wave sleep)
How many cycles of NREM and REM do people experience on average?
5 cycles
Each cycle of REM and NREM sleep lasts approximately how long?
70-90mins
Periods of NREM sleep constitute what percentage of. Total sleep time?
80%
What two opposing processes interact to strengthen sleep?
- Homeostatic drive for sleep
- Circadian system
What are the benefits of sleeping in time with your circadian rhythm?
- Quicker onset of sleep
- Fewer awakenings
Where is the ‘physiological pacemaker’ located?
Suprachiasmatic nucleus of the hypothalamus
Melatonin is secreted from the ________
Pineal gland
Onset of secretion for melatonin is early evening and peak levels occur when?
Middle of the night
Central melatonin receptors are concentrated where?
Primarily in the suprachiasmatic nucleus in hypothalamus