How do you stay awake during long drives?

Answer 1

eat or drink something that is sour like unsweetened lemonade,tamarind fruit, green mangoes,try to sip hot coffee without the milk and lots of sugar.

However, if none of this works and you feel yourself slipping, pull over immediately and take a break. It's better to have your journey extended than have/cause an accident because you weren't able to react in time.