Habits  that I incorporated after reading the book: no gadgets in bedroom after 8 pm, no reading in bed, go to bed before 10.30 pm. Things I learned from the book: Key factors that affect sleep negatively:  unbalanced diet (macro and micronutrients), hormone balance, lack of exposure to sunlight, not being active physically, low magnesium level, high stress level, exposure to ‘blue’ light from gadgets 1-2 hours before bedtime.