four times you should avoid drinking coffee:

1. Before Bed: Coffee can disrupt sleep patterns, so it's best to avoid it in the evening.

2. Right After Waking Up: Your body naturally produces cortisol in the morning to wake you up, so wait at least an hour after waking before having coffee.

3. When You're Dehydrated: Coffee is a diuretic and can worsen dehydration, so drink water first before reaching for coffee.

4. On an Empty Stomach: Coffee can increase stomach acid production, leading to discomfort for some people, so it's better to have it with food.