Energy drinks and sleep 

Caffeinated soft drinks are very popular with young people today. Studies have shown that caffeine has a detrimental effect on sleep, but caffeine is much longer in the blood than people realize and it both delays sleep and reduces the quality of sleep. In this video, Erna Sif Arnardóttir and Ingibjörg Gunnarsdóttir review the effects of caffinated energy drinks on sleep.