If you want to improve your sex appeal - get some sleep:
Bottom Line: When you're tired, look in the mirror, and think that you don't look near as good as usual...it's not just you. You probably don't. That's not meant to be harsh - just realistic. A new study just published in the Royal Society Open Science found that universally - we're less attractive when we're tired.
122 people were studied from one day to the next for attractiveness. The only change was the amount of sleep they received. 25 different university students ranked their attractiveness both days. Down the line the outcome was improved with rest. So it's clear that sleep can help you be your sexiest self!