Are likely a good thing

Night sweats are probably a very good sign.  People who start a healing regimen often have what is commonly referred to as a Herxheimer effect, or Herx for short, due to the release of toxins caused by die-off of unhealthy cells and pathogens.  Other common positive signs of using oleander includes temporary pain at the site of the cancer tumors.  That is just oleander, your body and the rest of whatever you may be doing or taking (and hopefully that is a lot of things) doing their job.

See:  http://www.proventus.org.uk/page102.html

Notably, night sweats and other Herx reactions are common when people take good doses of colloidal silver and other pathogen destroyers or when they do other effective disease fighting protocols.