Speech-language pathologists can earn the Certificate of Clinical Competence in Speech-Language Pathology (CCC-SLP), offered by the American Speech-Language-Hearing Association. Certification satisfies some or all of the requirements for state licensure and may be required by some employers.
The effect of lavender on sleep has also been studied. The inhaling of lavender odour during sleep has been observed to reduce the respiration frequency (you breathe in and out less), which is commonly used as an indicator of relaxation and sleep depth.
Lavender essential oil helps balance the body, may help with insomnia and is calming. Simply smelling something pleasant can have a positive effect on our psyche. Make sure you are using only a pure, food grade lavender essential oil. I met someone the other day who had a bad experience with lavender.