Carbon dioxide levels above 900 ppm in a bedroom impair sleep quality and reduce next-day cognitive performance.

“>2000-3000 ppm (extreme): strongly linked to fragmented sleep, morning sluggishness and markedly poorer cognitive performance.”

“excess CO2 is killing your sleep and daytime productivity. don’t believe me? sleep (PMIDs: 26452168, 32979003, 37076419): <750 ppm = safe zone”

“>900-1000 ppm: sympathetic nervous system activation, 1.3% decreases sleep efficiency, more time awake (5-10min+ per night), less deep sleep, morning grogginess, poorer next day cognitive performance.”

“There's been studies done in people sleeping in rooms that were 8 9,000 parts per million, and the next day they actually exhibited decreased cognitive function.”

“Once CO₂ levels rise above 900 parts per million (a shockingly common levels in closed bedrooms), sleep quality drops, fatigue increases, and mental sharpness suffers”

“Sleeping in a bedroom with carbon dioxide levels >900 ppm leads to a consistent and robust impairment in sleep quality and reduces next-day cognitive performance.”

“If that room is small, and again, lack of ventilation, that number starts to rise. If you are particularly sensitive to CO2 as well, which many people are, then that kicks off that entire cascade. You get pushed way more into sympathetic drive. And again, the biggest issue is you will see a subjective and objective massive change in fatigue and energy and cognitive function the next day.”