I have explored all the machines and devices designed to put herbs in the air we breathe. The common air/water balls costing from $25 - $125 on amazon generally work well for the price and can move allot of air---but made of plastic, your not going to find one made of glass and pure true essential oils do best in glass.
As the machines break down that we use, I am replacing them with a lifetime / permanent system. Basically because the small air/water balls will break eventually and the best one, rainbow, now cost $125 and it probably comes from china for $3 to make or less.
Good GLASS last forever
I chose to use the new 5 gallon wine making glass jugs, these can cost you $50+, but last forever. I would not use the plastic jugs, but they would work.
I fill the glass jug with 2-3 gallons of home made distilled water, use a new aquarium air pump of your choice of sizes.
Could be a small $5 pump that has 1 hose
a $12 pump that uses 2 hoses
or a 5 hose pump for $35
ALL DEPENDS on your choices of how much air you want to move in your bed room.
An aquarium pump is made to last a long time and they are cheap to replace.
Otherwise 30 0r 55 gallon drums can be used with an air blower and do an entire house.
Otherwise a rainbow style sweeper that uses water can do the entire house.
No matter what your choice, the idea is simple, breathe in herbs as you sleep every night your entire lifetime, from birth till death---