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.
Pruning lavender varies according to the type of lavender you're growing. English lavender (Lavandula angustifolia) is the most commonly grown and the hardiest lavender of all. It has needle-like silvery leaves and bears short, upright spikes of flower in midsummer.