I recommend the BioTox diffuser as a sleep aid.

This is a diffuser placed on the bedside table for use. You may have heard of aromatherapy. The product I use contains bergamot. Bergamot is said to be effective in relieving tension and reducing stress. It is known to help prevent insomnia and improve the sleep environment. Among various aromatherapy scents, it is said to have excellent calming effects, so I recommend trying it if you're interested.