Use of an iPad in bed before turning the light off decreases subjective sleepiness.

Latency to sleep onset and time in different sleep stages was similar in the two reading conditions.

30 min of reading a story on an iPad before bedtime delays EEG dynamics of slow-wave activity.

Even at low illumination level (58 lux), blue-enriched light from a tablet can impact directly on sleep EEG activity.

The use of electronic devices before bedtime may affect alertness, circadian physiology, and sleep.