2008 Renault Koleos Problems

After I have driven the car the brake lights come on over night even though I have turned everything off

Happened all of a sudden. Loss of power and whatever gear it is in it won't go over 28,000 revs

Hi , i think i have a problem. the p light (handbreak light) goes off when im driving then when i turn the car off and lock it the p light remains on, the handbrake is working fine,its a real pain as i think it drains the battery! all this ...