Czeisler

Question 1

What was the aim of Czeisler’s study

Answer 1

To see if the SCN could be quickly trained with light/dark treatment to help nightshirt workers adapt to their work schedule

Question 2

Who participated in czeislers study

Answer 2

8 men age 22 to 29 with no previous sleep disorders or night shift experience. They weren’t suffering from jet lag and told not to consume any drugs (eg caffeine/alcohol)

Question 3

How was Czeislers study conducted (method)

Answer 3

There were 2 groups - control & experimental
Control group - ordinary light (150lux) then exposed to light on transit home where they go to sleep
Experimental group - extreme bright light (10,000lux) then blackout conditions on transit home to sleep
Both groups told to come in at 11:45pm for 7days. Mainly did what they want but also did cognitive tests and alertness questionnaires

Question 4

What did Czeisler find

Answer 4

men under the treatments were sleepier during the day and slept 7.7 hrs compared to controls of 5.7 hrs. Alertness and performance indices improved during the night shift for the bright-dark treatment.