If it's during school time then its obvious, I get up to do some rushed homework so my teachers think I at least tried. It doesn't take to long and my record is just under half an hour from getting up to getting to school.
If I'm on camp, well I can only lie on rock solid ground, with stones sticking into my back, for so long while conscious. Or if I'm sharing a tent with someone who brought a phone with them, there only so much loud conversation right next to my ear I can take, especially at 7 am. Bloodstains are a pain to get out of tent material and I would have to hide the body before everyone else gets up.
During holidays or weekend, the morning only exists between midnight and about 3 am. I only get up to fool my parents into thinking I did something productive while they were at work.