I get pissed, too. The couple hours I slept in could have been used for chores, homework or...anything! Ugh! When I sleep in, it's either because I'm deprived or I'm having a vivid nightmare that disables my sense of the outside world. That happened today, actually. I was shaken awake at 1:45pm and I woke with a mild anxiety attack because the last thing I remembered was struggling to free myself from a gigantic spider web while dozens of arachnids poisoned me.
So from now on, this one's using an alarm to wake up because this happens way too often. The time I waste sleeping could be spent on something useful. >:[ Bleh.