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<BODY BGCOLOR="white" TEXT="black" LINK="blue" VLINK="blue" ALINK="blue" > <P><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><A HREF="http://www.choicehme.com/"><H1></H1></A>. The symptoms occur at night while we are sleeping because our respiratory system is also trying to rest. Troubleshooting Oxygen Concentrators and Portable Oxygen Systems. The harmful allergens are actually found in the dust. <a href="http://www.yahoo.com" target="_blank"><img src="image3.gif"></a> . </FONT></P> </BODY>