How to Avoid Simulation Sickness from FPS or TPS

GENERAL STRATEGIES

* Adaptation: The only reliable way to beat simulator sickness is to
play often and build up your resistance.
* Play short sessions at first.
* Play only one session per day at first.
* Don’t go for more than a week between sessions when you’re in
the adaptation phase because you’ll “unadapt” yourself.

BEFORE YOU PLAY

* Don’t play if you’re extremely tired or if you have a cold/flu
* Turn off all other lights in the room.
* Sit far away from the TV — as far back as you can while still being
able to read small text. Try to make the field of view around the TV
set as large as possible to give your eyes some “grounding” room.

WHILE YOU PLAY

* Short sessions! Short sessions! Short sessions! I know this is
frustrating when you have a cool new game, but try to stop
playing BEFORE you get sick. Play for only 10 minutes at a time if
you can. As you get adapted, your game time will last longer.
* Minimize your head movements.
* Close your eyes when you press pause and turn your head away
from the screen before opening them.
* If you can help it, don’t do too many “fancy” maneuvers like
airplane rolls or spinning around excessively until you get adapted.

adopted from : HERE