Actual Test

Will working late at night influence the next day's work?   
Absolutely yes. If you are being pressurized by a backbreaking deadline and 
have to burn the midnight oil completing it in time, the chances are that you will 
feel completely fatigued and lose your appetite the next working day. This is 
simply  because  a  good  sleep  is  important  for  your  body  to  recover  from 
exhaustion. What I mean here is that it's better if you turn in early and wake up 
earlier than being a night owl and lie in the next morning