Wrapping banana stems does really work to slow the ripening by containing ethylene gas.
When you wrap the banana stems with plastic wrap or foil it slows contains the ethylene gas, which slows the ripening of the bananas.
Wrapping the banana stems after you separate the bananas seems to work better than wrapping the banana stems when they are kept together.
But you can also wrap the banana stems together without separating them.
The idea is to trap the ethylene gas in the bananas which promotes ripening, near the stem and slow it's spread to the banana.
Using banana stands or banana hangers also work to improve the banana freshness by preventing bruises and allowing for better airflow.
The banana stand or hangers which allow better airflow, slows the release of the ripening ethylene gas, although the effect can be subtle.
But the banana stands keep the bananas from sitting in their own gas and getting squished, which makes the bananas last a bit longer and remain firmer inside despite external browning.
Although some tests show minimal visual difference, but hanging the bananas is best for air circulation and bruise prevention when compared to fruit bowls where the gas gets trapped.
If you eat bananas quickly then you won't usually have an issue when the bruising or rotting of the bananas.
Bananas are also good for sleep and contain nutrients that support muscle relaxation and healthy sleep cycles.
Eating a banana before bed can help you with your sleep and promote a restful nights sleep in many people.