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RE: Sleeping too little or sleeping too much? Both will affect your cognitive functioning
Nice article :) You mentioned melatonin levels and bright light, in fact, electronics (TV, PC screens, Phones etc..) emit especially blue light which affects the pineal gland severely. There is a free app called f.lux, it allows you to decrease the quantity of blue light emitted by your screen, it helped a lot of persons to regulate their sleep cycle :)
https://justgetflux.com/
Thanks for that info, I hope it helps people. I have no problem with that since I have zero technology in my bedroom ;)