That is lesson 5 done.
The phone, the coffee, the lie in, the nap, and the clock you keep looking at.
Anything you wrote in this lesson is in your notebook, on this device only.
Where this lesson comes from
- Chang AM, Aeschbach D, Duffy JF, Czeisler CA (2015). Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences, 112(4), 1232 to 1237. Presented in the lesson with its limits attached: a small laboratory study, high brightness over several hours, and a design that cannot separate the light from the content.