 How do you know if you're not getting enough sleep? It's not actually that difficult. If you're able to function optimally during the day, you're firing on all cylinders, then you're probably getting the sleep that you need at night. If you're depended upon an alarm clock or somebody else to get you out of bed, you're probably not getting enough sleep. If you oversleep extensively on free day site, like the weekend, if you take a long time to wake up, if you feel irritable, sort of fatigued, sleepy during the day, if you crave a nap, if your behavior seems to be overly impulsive or doing stupid and unreflective things, if you're craving caffeinated and sugar-rich drinks, all telling you you're not getting enough sleep. And importantly, you need to listen to others. If your friends, family, and colleagues are saying, oh, you're a bit more sort of irritable, this is all telling you you're not getting the sleep that you as an individual needs.