If you have sleep problems at night and if you are around computers, then this is for you.
According to one study (link below), blue lights can affect your sleep.
What do 19th century bed ropes and blue lights have in common. They play an underlying role of sleep, then and now.
The saying sleep tight is the lore of many tour guides. They will tell you how beds were made with a mattress support of interwoven ropes. In time the ropes would sag and require tightening. Thus the term, sleep tight. That is a verbal legend with out any historical proof. All we know for sure is that rope were the ulterior support for sleep.
Actually according to wordsmiths, the saying “sleep tight” dates back to 1886 and not nearly as old as the beds.
Also, the wordsmiths will tell you that the word “tight” in the 18th and 19th centuries meant simply “soundly.”
So if you want to sleep soundly, make sure there are no blue lights in your sleeping area such as come from your computer. Blue lights it seems, play an underlying role in our being alert.
One study found that blue light exposure promoted alertness. This even while the participants were asleep and eyes were closed.
So, eliminate the blue light, sleep tight, and get a good nights sleep tonight.