The causes may be low oxygen or the stress of waking up often during sleep.

In all other organs low oxygen causes widening of blood vessels.

They prefer still waters and can survive with low oxygen.

The result of lower oxygen he claims is, among other things, anxiety, tension, or irritability.

Would the heat or the low oxygen (partial pressure one-eighth Earth normal) kill him first?

The water in some areas has four times the salt content of the ocean, as well as low oxygen.

Assessment of molecular interaction between low oxygen and estrogen in fish cell culture.

A related term is hypoxia, which means low oxygen.

But at least she'd acclimated to the low oxygen.

High pressure in the brain and low oxygen are thought to set off the overproduction of glutamate.