What are the daily rhythms affecting humans?
What is consciousness?
What happens when you sleep?
25 hour clock
Peak levels in late afternoon
Best time for physical tasks
Controlled by suprachiasmatic nucleus
SCN = Internal timing mechanism
Daylight stimulates the SCN, which inhibits production of melatonin in pineal
Darkness removes the inhibition, resulting in more melatonin... we feel tired
Jet lag and shift work
Phase advance more difficult than phase delay, e.g., flying Vancouver to Halifax
more problematic than east to west
Jury still out...
More effective for delay
Probably works by relievin