chlorine and fluoride both attack oxygen in the body also carbon monoxide is bad, when the british government started the insulating the houses project monoxide deaths increased a huge amount.
a few plants you might want to have inside are aloe vera, cactus and mothers tongue all give out oxygen at night where as most plants take in oxygen at night,
you could also get a cool mist humidifier and use a bottle of 3% food grade hydrogen peroxide every night this would create a hyperbaric oxygen chamber in your room and you will certainly get a better nights sleep
also to replenish your blood supplies of haemoglobin find a beekeeper who can sell you some Propolis, this has increased blood by 25% over 8 weeks in some people.
do not buy this in a shop as the legal level is only 1 ppm and you do not know what you are getting.