Because photosynthesis of plants is not continuous, respiration is continuous.
In other words, most plants are absorbing oxygen and exhaling carbon dioxide for 24 hours. Sunlight absorbs carbon dioxide and releases oxygen. When the illumination is high, the amount of oxygen released will far exceed that absorbed. At the end of the day, it seems that plants do increase a lot of oxygen, but when everyone is resting at night, it is also the time for them to absorb oxygen. Although the oxygen consumption of a single plant is likely to be small, it is far better than nothing.
Especially the bedroom with small total area and short lighting time.
Plants with strong fragrance, such as cordate telosma and lily, can't be put in the bedroom. Long-term inhalation of strong fragrance will affect the quality of sleep.
If you have a favorite plant and want to put it in the bedroom, it is recommended to put it in summer and open the window for air. Or move the plants to the living room at night.
Put more Sedum plants such as meat and rubber trees in the bedroom. Because this plant absorbs carbon dioxide at night, and then converts it until photosynthesis in broad daylight.
Plants do breathe and release carbon dioxide at night, but they don't absorb all the oxygen in the bedroom, unless the emerald plant is very huge, and if the bedroom is closed and there is no oxygen, the excellent people who sleep in it will be in danger. Compared with the oxygen consumed by plants, people consume much more oxygen in one night when they are aware of the quality of sleep, so if there is a risk, it is also a risk for plants.
In fact, the respiration of plants is going on all the time, but the compressive strength of plant photosynthesis is greater than that of respiration in broad daylight, so the carbon dioxide produced by respiration can be quickly utilized by photosynthesis. At night, photosynthesis stops and respiration continues, so jadeite plants will consume oxygen at this time.