2. Consider the number of brightly lit screens to which you expose your eyes and your suprachiasmatic nucleus every night: TVs, computers, tablets, smartphones, and perhaps even more. How much time do you spend on these screens? How close to bedtime? Do you look at any screens while you’re in bed? How have you noticed your sleep being influenced by screen time near bedtime? Will you (or do you) allow your kids to use screens when their bedtime approaches?