It is true that in some cases, allergies and sleep problems can be improved through chiropractic care. When the cause of these problems stems from the spine and nerve system - absolutely. Speaking first hand, I have witnessed tremendous improvements in patients who used to suffer from allergies...
There are cases, however, that are *not spine/nerve related. For example, I am "allergic" to shrimp, but all the chiropractic adjustments in the world won't do a thing for it.
The same is true for sleep... I've personally helped many patients with sleep disorders that are related to an over-activity of the nervous system. At the same time, there are patients who can't sleep due to emotional/mental stress. If, for example, someone fears that they may lose their job, or that they can't pay their mortgage next month, a chiropractic adjustment isn't going to fix those issues.
If you'd like to know more, and perhaps meet with a specialist in your area, I'll point you to this website: www.UpCspine.com - it's a great resource.
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