I am 38 next month. My periods have been on a regular 28 cycle almost to the hour since I can remember..BUT I have started to have 25 day cycle and keep waking up feeling so hot I have to check to see if someone has turned up the heating. Am I mad or could this be the beggining of the menopause? Please could anyone let me know as everyone I know has not had this before the age of 45!