CNN: Tips For Better Summer Sleep

http://www.cnn.com/2013/06/06/health/sleep-summer

Tune out technology & blue light prior to bedtime–
The problem is that the blue spectrum light emitted by smartphones, iPads, laptops, desktops and TV sends a signal to our brain that we’re not going to sleep. The release of melatonin, the sleep hormone, is inhibited, which can hinder our sleep quality and quantity. So, commit to turning off technology at least half an hour before bedtime to optimize your sleep.