I'm not sure if I'm understanding correctly but do you mean for example...
You wake up at 6am and turn your lights on and then say an hour later you leave for school and turn the lights off?
If that's what you mean, then, I wouldn't do it. I'd just wait until you get home from school and turn them on.
Nooo, well basically you know that timer thing that you stick into the socket and then plug your appliance into and you can set what time it allows electricity through? so for example you would plug a lamp into it and set it to come on at 7 o'clock to 9 in the evening so potential burglers dont think your on holiday, and you dont get burgled? well ive just used the same principle but with my fish tank, on at 7.30 till 9. off untill 4. on untill 7.30 or something. enlightened?