Digital devices are artificial light sources. Light exposure is related to how well we sleep. Interestingly, the way that we interact with light during the day might help with us sleep well at night. 

• Research has shown that people who spend time near office windows during the week day sleep better than people without office windows.
• Interestingly, some research suggests that bright light exposure during the daytime might counteract sleep disturbance from light exposure during the night.
• Light exposure during the night time is often coupled with light-emitting devices like tablets and smart phones. Information on those devices could be stressful or engaging, which may lead to sleep disruptions.