Get enough sleep the night before
Stand up and move around regularly
Drink water
Get fresh air
Keep the room bright
Avoid heavy meals
Limit alcohol
Use caffeine in moderation
Take short breaks
Wash your face with cold water
Chew gum
Listen to upbeat music
Keep your mind engaged
Sit upright
Avoid lying down
Snack on light, healthy foods
Reduce screen dimness
Breathe deeply
Talk to someone
Change tasks often
Take a short nap if possible