Every brain needs rest!!!! You will be cranky after working for more than a couple hours. So you should sleep and let your brain to rest. Especially when you feel tired and sleepy, it means your brain is “overpowered”, and it has to be calmed down to take in all the things you have been working on. Whether you want to or not, your brains are filled with tons and tons things of everything in your life. So go get some sleep tonight!