The reason people sleep with a glass of water under the bed is because of beliefs that the water absorbs negative energy and promotes positive vibes within a space.
The glass of water under the bed essentially acts as a way to cleanse your room while you sleep.
Although it's not based on any scientific evidence and is just a superstition.
When the water has absorbed the negative energy while you sleep the water should have bubbles or cloudiness.
When you see the water with bubbles or cloudiness it is said to mean that the water has absorbed that negative energy and cleansed your room.
Experts in Feng Shui sing the praises and power of water, an element believed will create harmony and tranquility in your space.
That's why Feng Shui pros say a glass of water under your bed will absorb the bad energy while you sleep.
In some cultures, it is believed that placing a glass of water under the bed can help absorb negative energy or spirits, promoting a peaceful sleeping environment.
Some people think that water can act as a protective barrier against bad dreams or disturbances during the night.