For years I left mine on all the time and overnight...that is until fall 2004 when one of our wonderful Dis'ners, 'Emmasgrammy' (Lynda) , suffered a terrible tragedy. She lost her dear daughter

and 2 precious grandchildren

in a terrible house fire caused by their computer overheating

. I'll never forget her sad devasation nor the heartache we all felt. Since that day DH & I turn ours off when we leave or go to bed. Better safe than sorry.