Spearmint [Mentha spicata]  (leaf): Remarkably augmented the sleeping time induced by pentobarbital, suggesting a sedative and hypnotic effect of the plants extract

Reference: https://pubmed.ncbi.nlm.nih.gov/30158996/

• Spearmint has antibacterial properties that can help reduce inflammation and fight infections.

• It may also aid digestion by relaxing the stomach muscles and reducing symptoms of bloating and gas.

• The menthol in spearmint may help alleviate headaches and improve respiratory function by opening up the airways.

• Spearmint has a refreshing scent that can help reduce stress and anxiety, promoting relaxation and better sleep.

• Preliminary studies suggest that spearmint may have anti-cancer properties and could potentially inhibit the growth of tumor cells.

Sources: 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8300686/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3264926/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3607906/

https://sabaiarom.com/essential-oils-a-natural-remedy-for-stress/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4017674/