You'll need to follow the first tip to follow this one: get enough sleep. You'll be a lot more productive after a good nights rest. Its tempting to power through without sleep, but it will cost you later. Without sleep you're more likely to make mistakes that will eat up precious time. It will take you longer to make decisions, get writing skills done or write my essay. If you're model building late at night, you're also putting yourself at risk of seriously hurting yourself.