Don't be fooled: staying up an hour later doesn't mean you gain an hour in productivity. In fact, losing sleep is directly linked to poor focus and memory. Sleep is vital and here are three ways to get more of it:
1. Clear your mental to-do list. Write a list of unfinished tasks and unresolved issues before getting into bed. Put them down on paper so they don't take up mental space when you're up in the middle of the night.
2. Go to bed earlier. Set yourself a bedtime and stick to it. You may feel like a child, but there's a reason parents badger kids to bed.
3. Wind down. Give yourself 45 minutes to relax before going to bed. Drink tea, read a book, or listen to music.
Source: Guide to Managing Stress