YES! Many websites recommend having plants in the sleeping room to produce O2. Plants actually consume O2 and produce CO2 at night, through not very much.
I sleep terribly at home and I am trying out to find out why. Two people and a dog in a room should not be an issue if the window is a little bit open.
you might want to consider temperature as a possible culprit. a lower temperature is a signal to the body to curl up and sleep, and a consistently cool (relative) temperature keeps you in that state. when we wake up, our bodies ramp up our metabolism/temperature to rouse us out of slumber. i know i'm ready for sleep when i impulsively reach for the sheets. with two people, a dog, and only a cracked window, the temperature might be rising above your sleep signal during the night (i wake up often in the middle of the night and can literally feel the heat rising as i gain consciousness).
I sleep terribly at home and I am trying out to find out why. Two people and a dog in a room should not be an issue if the window is a little bit open.