Take a walk instead of a coffee-break.

A walk in the fresh air is almost always a good idea – especially if you haven't had the opportunity to exercise or spend time outdoors earlier in the day. It gives you a short but important recovery and an energy boost to help you stay focused. 

WHY IT HELPS:
Daylight and exercise both help to reduce your stress levels and improve your circadian rhythm. When your stress levels are lower, it’s also easier to unwind in the evening to fall asleep.