You need sleep to feel energetic and sleep gives us proper rest. Staying up late at night will give unnecessary cravings and will also mess up with the hormones. So it is better to sleep as early as possible. Avoiding to stay up late after 12 am will be one of the best things you will do for yourself. If you are someone who hates to wake up very early, keep a standard wake up time for you before 8 am and try to wake up at 4 am every once in a while and go to the beach or for a drive or jog and enjoy life. Soon, you'll be happy to wake up early as you will have something to look forward to and a lot of time in hand.