its all about REM sleep. if you go to bed and get between 3-6 hours of sleep you will naturally feel very exhausted because your body was setting itself up all that time to go into REM and sweep the brain with delta waves, when it is abruptly interrupted during that calming process by the blaring of alarm clocks or parents talking loudly in your face or bright lightbulbs shining into your face from the cieling. the trick is to either get more than 7 or less than 3, as that way your body either undergoes a full sleep cycle or only undergoes the first or second stages of it without getting too deep into sleep.
Yeah, Thats the weird thing, it feels like the exact opposite with me, I go to sleep for over 7 hours and I'm tired as stuff when I wake up, but If I go and sleep for any time under that, I'm perfectly fine.
also I'll probs set it to something like what would look like the default so it looks like the thing broke or something, my parents arent exactly computer geniuses so they probs wouldnt catch on.
though I'm gonna wait for now until past friday cause I'm gonna get my reportcard stuff so maybe they'll change their mind about it by then or change it a bit more