Captured Thought: Sleep Deprivation

Sorry I've kinda been mentioning sleep a lot lately... but that's what's been an issue with me lately... meh...
So anyways... I always wondered how I could get 5 or 6 hours of sleep one night and feel utterly exhausted the whole next day, but I could sleep 2 or 3 hours in a night and feel very alert and awake. Obviosly, nothing beats 10 hours of sleep, but that happens too rarely, so I'll focus on the smaller quantities of rest. I had always just assumed that when i felt so chipper after pulling a near-all-nighter it was because I was loopy and delusional from sleep deprivation because I couldn't think of anything else to explain it.
On a normal school day, I wake up at about 6:30 or 7:00 a.m. However, this weekend was Homecoming weekend, so after a busy Saturday, some of the girls (myself included) ended up staying until about that time... WE knew we had to get up by 9:20 to go to breakfast. SO I probably got about 2 and a half hours of sleep, and I felt just fine through breakfast, and I still feel okay. I also thought to myself... today still feels like a Saturday. Then it hit me. My body still thought it was Saturday. I didn;t get enough sleeo to officially transition myself from one day to the next. Those hours of sleep were just like a nap that I took before I went on with the rest of my mentally-48-hour Saturday. Now I get it. Let's hope that it doesn't become a 72-hour Saturday now...