Yes, allergies can cause this. Suggest a daily antihistamine (such as Claritin, Zyrtec, etc.) if you aren't already taking any. And Magnesium is also great for relaxing muscles, with the bonus effect of improving Asthma (if you have it).
Chronic Lyme, Bart., Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut dysmotility & non-specific inflammation, Lupus, Osteoporosis, etc.; G-Tube
Meds: Flagyl, Domperidone, Zofran, Claritin, Andrographis & other herbs, homeopathy, supplements, etc.