sleep circadian rhythms 2 Flashcards
effectiveness of light therapy
earlier the light exposure the stronger the effects
what other conditions can benefit from light therapy
bulimia, depression m bipolar, shift work and jet lag
negative effects of light
in the evening intense light exposure interferes kWh melatonin secretion and delays circadian rhythms - struggle to sleep
possible solution tinted glasses
filter out the blue spectrum of lights blue light suppresses melatonin secretion
melatonin role
induces physiological changes that promote sleep, such as decreased body temperature and respiration rate
sleep deprivation therapy for major depressive disorder
effective in around 60% of patients with major depressive disorders
sleep deprivation = decrease in depressive symptoms
therapy is
rapidly acting
effect occurs after the first night during the early morning
how does sleep deprivation therapy work
malfunction of the clock gene machinery in depressive disorders
resets or reboots the clock gene machinery
clock gene machinery
complex interplay of activity of the genes
daily sunshine is related to
serotonin reuptake
low levels - associated with depression
immediate effects of bright light
more attentive after high exposure of light - increase bitty to focus
working conditions - bright white light
increased participants ability to concentrate
SAD
seasonal affective disorder
bright light therapy can be used
diagnostic criteria for seasonal affective disorder
two or more depressive episodes , spontaneous remission , atypical symptoms - daytime tiredness , increased sleep duration, craving weight gain
increasing prevalence of SAD with
increasing latitude - more up north
