alarm problems

hi all can anyone help me i have a nov/01 1.8 es petrol freelander it has started to set the alarm of by it self all most the same time every morning   < 3.30 4.00am >  for the past 3 days also i have noticed it drinks the fuel like theres no tomorrow any help  many thanks dave

Do you have any windows open?
Do you have a check engine light on?

thanks for you reply mike all windows are closed i have'nt seen any warning lights on dash board  thanks dave