This was my first time purchasing 1800 thread counts sheets.  I got them for for my son for Christmas.  The sheets are very soft and thin.  I did not expect 1800 thread count to be so thin.  I don't know, maybe they're supposed to be this thin.  They are very, very soft.  I hope my son likes them.  
Please respond, someone and enlighten me about 1800 thread count sheets.
Clueless, 
Sandy