My0 Ds(4yrs) is on his 4th day of chicken pox and he has had a nightly temperature between 38.4 and 38.9 last night was really bad and at 4.30 this morning it peaked at 39.9 Temperatures were taken with braun ear thermometre. All my books seem to contradict themselves as to what point a temperature becomes dangerous, can anyone help me??? Thanks in advance