If you have breathing or sleep disorders, you might want to try keeping these plants fromGARDEN TIPSon Youtube.
Moreover, they are also beneficial as they absorb toxic gases like formaldehyde and benzene.
Watch the video below to know the following plants.

Image credits: GARDEN TIPS via Youtube
#2 Snake Plant
This plant can tolerate any light conditions.
It also requires less watering.
For one person, 6-8 plants are recommended for best results.

For one person, three plants of at least 18 are recommended.
Particularly very beneficial for those suffering from sleep apnea and breathing disorders.
The only drawback is its a flowering plant and needs sunlight, especially in its flowering season.

Ir also needs daily watering.
What you could do is shift the plant to sunlight daily or alternate days for best results.
Keeping a neem tree close to the window can be a very good option.
Keep about 4-6 plants in your room for best results.
#9 Orchids
This plant releases oxygen during the night time though in small amounts.