Reduce sensory inputs. Take a five minute break every hour or two and close your eyes. It helps to give your eyes a rest, especially after a long time working at the computer or reading.
Drink plenty of fluids. Don’t forget to drink fluids, especially water, to avoid dehydration which may contribute to headaches.
Eat something. Make sure you are eating regularly; do not skip meals. Low blood sugar due to skipping breakfast or lunch is a common cause of headaches.
Take a nap. Short 20-minute rest breaks or naps often re-charge your energy and may help prevent a late afternoon tension headache. However, avoid naps if you have trouble sleeping through the night.