It sure is if you're a mouse.

There's no human data at this point.

I don't see the word "toxin" anywhere on that page.

You're right. I guess the connection being reached for is "lymphatic transport" (title of paper) -> "waste transport" (synonymous) -> "toxin removal" (a very specific type of waste transport?)

The lymphatic system is specifically for removing toxins, so naturally it's function is implied

No, a toxin is a poison, usually produced for predation or defense. As Wikipedia correctly notes,

In the context of quack and alternative medicine the term "toxin" is used to refer to any substance supposed to cause ill health.

What the body produces and might need to eliminate is metabolic byproduct or waste, nothing to do with "toxins". The term used in this context makes me cringe.

what...? Do you not know any biology at all? Of course the lymphatic system is meant to eliminate toxins... Jeez, take some bio 101 before posting, you sound like a quack

They are taking issue with the term "toxin" - not the functionality of the lymphatic system. Their comment explicitly said `metabolic byproduct or waste, nothing to do with "toxins"`.

But of course it the lymphatic system eliminates toxins too. I mean, obviously this is all getting into semantics, but the lymphatic system helps to eliminate more than just metabolic products and waste, it will also help eliminate dead bacteria, heavy metals, etc, which could certainly be called toxins

Side sleeping has positive effects on airway maintenance, may help get in and stay in the deeper phases for some people with obstructive apnea.